A federal appeals court has cleared the path for the state of Texas to independently arrest, prosecute, and deport individuals who cross its border illegally — all without needing the blessing of the federal government.
The ruling represents the culmination of a years-long legal battle that has tested the boundaries of states’ rights, federal supremacy, and America’s broken immigration system.
The 5th U.S. Circuit Court of Appeals cleared the way for Texas authorities to enforce key parts of a law that would allow state officials to arrest and deport people suspected of having illegally crossed the U.S.-Mexico border.
The ruling sent shockwaves through immigration advocacy circles and was celebrated by border-state lawmakers and law enforcement officials who have long argued that the federal government under the Biden administration had abandoned its duty to protect the southern frontier.
Texas Governor Greg Abbott signed one of the harshest state immigration laws in modern U.S. history, authorizing state officials to arrest and seek the deportation of migrants suspected of crossing the border with Mexico illegally.
The law, known as SB4, gives Texas law enforcement authorities the power to stop, arrest, and jail migrants on new, state-level illegal entry charges.
It also allows state judges to issue de facto deportation orders against suspected violators of the law.
“The goal of Senate Bill 4 is to stop the tidal wave of illegal entry into Texas,” Abbott said at a signing ceremony along the border in Brownsville.
“Senate Bill 4 is now law in the state of Texas.”
For Abbott, it was a declaration of war against what he and many Texans viewed as an existential crisis unfolding in real time at the state’s doorstep.
That law, which Texas Governor Greg Abbott signed in December 2023, would make it a state crime to illegally enter or re-enter Texas from a foreign country and would empower state judges to order that violators leave the United States, with prison sentences up to 20 years for those who refuse to comply.
The stiff penalties were designed to serve as a strong deterrent to illegal crossings and as a direct signal to cartels and smugglers that Texas was no longer willing to be a passive bystander.
Texas Senate Bill 4 was championed by state lawmakers who argued that stronger state-level immigration laws were necessary due to federal inaction.
The primary proponents of SB4 included key figures in the Texas Legislature who were vocal about the need for stricter immigration enforcement, including Governor Greg Abbott and Lieutenant Governor Dan Patrick.
The law did not spring from nowhere.
Texas had been watching for years as hundreds of thousands of migrants streamed across its borders, overwhelming local communities, straining resources, and posing serious public safety challenges.
More than 2 million migrants were apprehended by U.S. Border Patrol agents along the southern border in both fiscal years 2022 and 2023 — the highest levels on record.
For Texans living near the border, those were not just statistics — they were a daily reality.
In late 2023, the Texas legislature passed SB4, which was set to go into effect in March 2024.
The law would make it a state crime for an alien to illegally enter Texas directly from a foreign nation.
But from the moment the ink was dry on the governor’s signature, powerful forces mobilized to stop it from ever taking effect, setting off a legal odyssey that would consume the courts for years.
Just one day after Abbott signed SB4, the American Civil Liberties Union, the ACLU of Texas, and the Texas Civil Rights Project filed a lawsuit challenging the law.
Then, on January 3, 2024, the Department of Justice under President Biden also filed a lawsuit against SB4.
The Biden administration argued that immigration was exclusively a federal matter, and that Texas was unconstitutionally usurping that authority.
In March 2024, the U.S. Supreme Court allowed Texas to enforce SB4 in a 6-3 ruling that would allow the law to go into effect while litigation continued in the lower courts.
However, the law was in effect for only about seven minutes before the Fifth Circuit issued a halt pending further review.
It was legal whiplash of the highest order — and a preview of the bitter battles that lay ahead.
A 2-1 panel of the 5th Circuit in July 2025 upheld the injunction blocking the law, saying the state law would interfere with the federal government’s ability to enforce U.S. immigration laws.
But the full appeals court, among the most conservative in the nation, agreed to reconsider the case at the urging of Republican Texas Attorney General Ken Paxton.
The conservative 5th U.S. Circuit Court of Appeals ultimately ruled that the plaintiffs lacked standing to challenge Senate Bill 4.
“These Plaintiffs voluntarily incurred costs to advocate for clients. Under recent Supreme Court precedent, that falls far short of conferring standing. We vacate the preliminary injunction to the contrary,” the 5th Circuit’s order states.
The law created state criminal penalties for crossing the border into Texas, matching the federal law.
It also called for the state to carry out its own removals of illegal crossers.
In other words, Texas was not creating a parallel system out of thin air — it was mirroring federal law while stepping in where the federal government had refused to act.
The Trump administration had dropped the case the Biden administration brought challenging the law.
Immigrant-rights groups that had also sued pressed on, but the 5th Circuit on a 10-7 vote concluded the organizations lacked legal standing to pursue their case.
A new ACLU-backed lawsuit sought to address that issue by instead suing on behalf of non-citizens who could be subject to four key provisions of the law.
One reactivated provision treats reentry into the U.S. as a state offense even for people now holding green cards or other lawful federal status.
Critics seized on this aspect of the law as potential overreach, but defenders argued it was a necessary tool to prevent legal status from being used as a shield against accountability.
Texas Attorney General Ken Paxton, who led the legal fight from the beginning, was jubilant after the ruling.
Paxton celebrated the Fifth Circuit’s ruling, calling it “a major victory for public safety and law and order.”
For Paxton, the years of courtroom battles had been more than worth it.
He had promised Texans he would not rest until SB4 was law of the land — and he delivered.
Texas’s laws were the spear tip of a push to argue that the surge of illegal immigrants during the Biden years constituted an “invasion.”
Under the Constitution, an invasion could trigger some independent state powers.
When he took office, President Trump embraced the “invasion” label to justify his own border crackdown, which proved extremely effective.
The flow of illegal immigrants sneaking across the southern border is down 95% under President Trump compared to the average month under the Biden administration.
That figure alone tells a compelling story about what is possible when there is political will to enforce the law — and what happens when that will is absent.
A sweeping 2023 Texas immigration law that lets state authorities arrest and deport people suspected of having illegally crossed the U.S.-Mexico border can go into effect after a federal appeals court lifted a lower court’s stoppage of certain provisions.
For border communities in Texas that have borne the brunt of the crisis, the news could not have come soon enough.
The legal philosophy underpinning Texas’s position has been reinforced at every turn by the federal judiciary’s conservative majority.
U.S. Circuit Judge Jerry Smith in the ruling said that just because the legal advocacy groups voluntarily opted to increase representation of immigrants adversely affected by the law did not mean they had standing to challenge it.
“When enterprising plaintiffs repackage a generalized grievance as an ‘injury,’ courts should rightly exercise caution,” Smith wrote, in an opinion joined by all but two of the court’s Republican-appointed judges.
The American Civil Liberties Union said in a statement that “any enforcement of S.B. 4 will cause immediate and serious harm: racial profiling of Black and Brown Texans, family separation, and the criminalization of people who have lived and worked in Texas for years. Texas judges would be required to order deportations regardless of whether a person is eligible to seek asylum or other humanitarian protections under federal law.”
Opponents vowed to continue fighting the law through every available legal avenue.
“This ruling is a procedural decision, not a ruling on the merits,” said Cody Wofsy, deputy director of the ACLU’s Immigrants’ Rights Project.
“It does not change what every court to examine similar laws has found: S.B. 4 is unconstitutional.”
But conservative legal analysts pointed out that the courts had now repeatedly cleared the way for Texas to enforce the law — and that the ACLU’s characterization ignored the mounting judicial record in Texas’s favor.
The practical implications of SB4 going into effect are enormous.
Texas law enforcement will now be empowered to arrest individuals suspected of entering the state illegally — a power that state troopers, county sheriffs, and local police departments have long sought.
State judges will also be empowered to order that violators leave the United States, with prison sentences up to 20 years for those who refuse to comply.
Legal observers say this could fundamentally reshape how immigration enforcement operates along the nation’s most-trafficked border corridor.
For Texas Republicans, the victory in court is also a victory of principle — a vindication of the argument that when the federal government abdicates its duty, states have not only the right but the responsibility to step in.
Governor Abbott had staked much of his political legacy on this fight.
From deploying razor wire along the Rio Grande, to sending buses of migrants to liberal cities, to now winning in federal court, Abbott has made border security the defining cause of his governorship.
The law was the latest effort by Texas to challenge President Biden on immigration.
The state’s early steps in that direction included deploying the Texas National Guard, installing buoys in the Rio Grande, and busing migrants to Northern cities.
SB4 was always meant to be the most legally transformative salvo in that campaign — and now it appears to have succeeded.
Supporters of the law point to concrete public safety arguments to justify its passage.
They note that among the millions who entered illegally were individuals with serious criminal records, gang affiliations, and connections to drug trafficking networks.
Texas border counties reported spikes in property crime, human smuggling activity, and dangerous vehicle pursuits involving fleeing migrants.
SB4, proponents argue, gives law enforcement the legal tools to deal with these realities.
The national implications of the ruling reach well beyond Texas.
Other border states and Republican-led legislatures across the country will now be watching closely, considering whether to pass their own SB4-style laws.
If Texas’s model survives further legal challenges and proves workable in practice, it could spark a wave of state-level immigration enforcement that reshapes the landscape of American immigration policy from the ground up.
Critics still warn that the law faces additional legal hurdles.
The Supreme Court has not definitively ruled on its constitutionality, and further challenges are almost certain.
But for now, for the first time in over two years of legal battles, Texas has the green light to enforce SB4 — and the state has made abundantly clear it intends to do exactly that.
Edna Yang, co-executive director of American Gateways, said in a statement the ruling was “a setback, not the final word, and we remain committed to fighting this dangerous law at every turn.”
