Rep. Steve King (R-Iowa) said he is “very disappointed by the lack of action” President Trump has made on reversing Obama-era policies on undocumented immigrants such as the Deferred Action for Childhood Arrivals (DACA) program.

“Every day they are complicit it is harder to resolve,” he told The Daily Caller Thursday. “Is [Trump] going to force us to go back to court again?”

“Every day this has been a violation of the Constitution,” King added of former President Barack Obama Barack Hussein ObamaGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high D-Day for Trump: September 29 Obama says making a voting plan is part of 'how to quarantine successfully' MORE’s executive orders on immigration.

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King said he wondered whether he and Homeland Security Secretary John Kelly “may not share opinions on the rule of law.”

King said he discussed ending programs like DACA with Trump three weeks ago but has no news of coming action on the matter.

DACA lets qualifying undocumented immigrants brought to the U.S. as children obtain work permits and relief from deportation based on their migratory status. The program has 750,000 people participating in it.

President Trump has ordered a crackdown on undocumented immigrants who commit crimes and he is significantly boosting the number of border patrol and immigration officers and judges. And he has called for work to begin on the construction of a U.S.-Mexico border wall.

On the campaign trail, Trump vowed to end DACA, but he has since spoken sympathetically of the young people who benefit from it.

“DACA is a very, very difficult subject for me,” he said in February, adding he wanted to approach the issue “with heart.”

“I have kids and grandkids, and I find it very hard doing exactly what the law says exactly to do, and, you know, the law is rough," he said.

Some DACA recipients have been detained by immigrations officers and set for deportation, prompting backlash from activists. Although they are not exempt from being deported, DACA recipients are not a priority for the Trump administration.