The Justice Department moved on Friday to dismiss its Biden-era challenge of an Iowa law that made it a state crime for some undocumented immigrants to enter the state, a victory for Iowa Republicans as the Trump administration pursues an aggressive campaign against illegal immigration.

The short filing submitted by Justice Department lawyers in Federal District Court in Des Moines did not provide any reasoning for seeking the dismissal, and it did not immediately remove judicial blocks on Iowa enforcing its law. A similar filing on Friday sought the dismissal of a Justice Department challenge to an Oklahoma immigration law that had also been blocked.

Justice Department officials did not respond on Friday evening to questions about whether the Iowa filing signaled a broader policy shift on state-level immigration enforcement, which it had opposed during Joseph R. Biden Jr.’s presidency.

Attorney General Brenna Bird of Iowa, whose office has defended her state’s law in court, celebrated the dismissal motion and linked it to President Trump’s approach to immigration.

“When the Biden administration failed to do its job and secure our borders, Iowa stepped up. And we never backed down — even when Biden sued us for it,” Ms. Bird, a Republican, said in a statement. “Today, President Trump, again, proved that he has Iowa’s back and showcased his commitment to Making America Safe Again by dropping Biden’s ridiculous lawsuit.”

Yaakov M. Roth, an acting assistant attorney general, was one of the Justice Department lawyers who asked for the dismissal of the Iowa case. No similar dismissal motion appeared on Friday evening on the public docket for a challenge to a similar Texas law that Mr. Biden’s Justice Department also sued to block.