President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE on Tuesday renewed his call for a crackdown on illegal immigration during an event honoring fallen law enforcement officers.

Speaking outside the U.S. Capitol, Trump called on lawmakers to fund his proposed border wall, pass new measures cracking down on so-called sanctuary cities and end what he called “catch and release” immigration laws.

“We don’t want it anymore. We’ve had it. Enough is enough,” Trump said at the National Peace Officers’ Memorial Service.

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He said current policies “release violent criminals back into our communities” and put police and border patrol officers’ lives at risk.

Trump also revived another controversial, but unfulfilled, campaign pledge: mandating capital punishment for people who kill police officers.

“We must end the attacks on our police and we must end them right now,” the president said. “We believe criminals who kill our police should get the death penalty. Bring it forth.”

Trump has become increasingly frustrated with U.S. immigration laws, blasting them as too weak and blaming them for an uptick in illegal border crossings this year.

He reportedly dressed down Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenDHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections Democrats smell blood with new DHS whistleblower complaint MORE for not being aggressive enough in going after people who cross illegally into the U.S.

Trump’s remarks are the latest sign he believes the government is moving too slowly to fulfill some of the core promises of his 2016 campaign, including building a “big beautiful wall” along the U.S.-Mexico border and shutting off illegal immigration.

Many of the administration’s proposals and actions, including using family separation to deter illegal crossings, have run into fierce opposition from immigrants rights groups and lawmakers.