Federal Judge Blocks Key Parts of Texas SB 4

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Only weeks after a federal appeals court ruling appeared to clear the way for Texas’s Senate Bill 4 (SB 4) to finally take effect, a federal judge has once again halted major portions of the controversial border enforcement law. The latest ruling blocks Texas from enforcing provisions related to unlawful reentry and state-directed removals just hours before implementation was set to begin.

The decision marks another dramatic turn in one of the most consequential legal battles over immigration enforcement and federalism in recent Texas history.

Texas Policy Research (TPR) recently analyzed the Fifth Circuit Court of Appeals ruling that dissolved an earlier injunction against SB 4 after determining the original plaintiffs lacked standing to continue the case. That ruling was widely viewed as a procedural victory for Texas and appeared to place the state on the verge of enforcing its own immigration-related criminal statutes for the first time.

But the new lawsuit, brought by individual plaintiffs rather than advocacy organizations, quickly reopened the constitutional fight before the law could officially take effect.

What the Federal Judge Actually Blocked

Importantly, Judge David Ezra did not block all of SB 4. Instead, the court narrowly enjoined the law’s reentry and removal provisions, specifically Texas Penal Code Sections 51.03 and 51.04, along with Articles 5B.002 and 5B.003 of the Texas Code of Criminal Procedure. Those provisions would have allowed Texas to criminalize unlawful reentry into the state by individuals previously removed from the United States or subject to outstanding removal orders. The law also authorized state judges to issue removal orders directing noncitizens to return to Mexico.

The ruling leaves unresolved broader questions surrounding the portions of SB 4 dealing with unlawful entry into Texas from a foreign nation, but it effectively halts the state’s attempt to independently administer removals and deportation-style enforcement.

Judge Ezra ultimately concluded that Texas likely violated federal supremacy principles by attempting to create a parallel immigration enforcement system.

The Court Says Immigration Enforcement Remains Primarily Federal

The ruling repeatedly emphasized that immigration enforcement and removal authority remain overwhelmingly federal responsibilities under longstanding Supreme Court precedent.

Judge Ezra leaned heavily on the Supreme Court’s 2012 decision in Arizona v. United States, which struck down major portions of Arizona’s own immigration enforcement law. According to the court, Congress has already created a detailed and expansive immigration framework that leaves little room for states to independently regulate removals or create parallel criminal enforcement systems.

The opinion argued that SB 4 crosses that constitutional boundary by authorizing Texas officers and state judges to independently detain, prosecute, and remove individuals based on immigration status.

The judge also expressed concern that allowing SB 4 to proceed could encourage individual states to create their own immigration systems, undermining the concept of a uniform national immigration policy.

Texas’s “Invasion” Argument Was Rejected Again

One of the most closely watched aspects of the case involved Texas’s constitutional “invasion” argument.

Governor Greg Abbott (R) and Texas officials have repeatedly argued that the ongoing crisis at the southern border constitutes an invasion under Article I, Section 10 of the U.S. Constitution, thereby authorizing Texas to act independently in defense of the state.

Judge Ezra directly rejected that theory.

While acknowledging Texas’s arguments and the current administration’s more supportive posture toward aggressive border enforcement, the court concluded that SB 4 still functions as ordinary criminal law enforcement rather than an actual wartime measure. The opinion argued that arresting individuals through civilian police processes and criminal courts does not constitute “engaging in war” under the Constitution.

Judge Ezra further warned that accepting Texas’s interpretation could dramatically expand state authority into federal domains far beyond immigration policy.

SB 4 Raises Asylum and Removal Concerns

Another major component of the decision involved federal asylum procedures and due process protections. The court found that SB 4 likely conflicted with federal immigration law because Texas courts would be prohibited from delaying prosecutions while asylum or federal immigration proceedings were pending.

Judge Ezra argued this could interfere with asylum claims, withholding protections, and anti-torture protections established under federal law and international agreements. The opinion also highlighted concerns that individuals removed under SB 4 could face violence or persecution if returned to Mexico, regardless of their country of origin.

Those concerns played a substantial role in the court’s conclusion that the plaintiffs faced irreparable harm if the law took effect.

Texas Still Views SB 4 as Essential Border Policy

Texas officials continue framing SB 4 as a necessary response to ongoing border security failures and inconsistent federal enforcement priorities.

Supporters of the law argue that Texas should not be forced to remain dependent on federal immigration enforcement when border crossings surge or when federal authorities decline to aggressively prosecute immigration violations. The state has also consistently argued that SB 4 merely mirrors existing federal immigration offenses rather than creating entirely new categories of prohibited conduct.

Critics, however, maintain that even “parallel” enforcement systems violate constitutional principles if states independently administer immigration removals and criminal prosecutions outside federal supervision.

That tension sits at the heart of the broader legal battle.

The Case Is Almost Certainly Headed Back to the Fifth Circuit

The legal fight over SB 4 is far from finished. Judge Ezra denied Texas’s request to stay the injunction pending appeal, meaning the blocked portions of the law remain unenforceable for now. Texas is expected to immediately appeal once again to the Fifth Circuit Court of Appeals, which has already spent years handling multiple rounds of litigation surrounding SB 4, and because the Fifth Circuit’s earlier ruling focused primarily on standing rather than the constitutionality of the law itself, many of the underlying legal questions remain unresolved.

Ultimately, the U.S. Supreme Court may once again be forced to determine the limits of state immigration enforcement authority and whether states possess broader constitutional powers during periods of heightened illegal immigration.

Why This Matters Beyond Texas

The fight over SB 4 increasingly represents more than just a dispute over immigration policy.

At its core, the case reflects a growing constitutional conflict over federalism itself. States like Texas are increasingly asserting that they possess broader sovereign authority to act when the federal government fails to address major policy crises.

At the same time, courts continue signaling deep skepticism toward allowing states to independently exercise powers traditionally reserved for the federal government.

That conflict is unlikely to disappear anytime soon.

As immigration remains one of the defining political issues in Texas and nationally, SB 4 may ultimately become one of the most significant federalism cases of the decade.

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