Rep. Steve King Steven (Steve) Arnold KingTrump, Biden deadlocked in Iowa: poll GOP leader: 'There is no place for QAnon in the Republican Party' Loomer win creates bigger problem for House GOP MORE (R-Iowa) on Monday announced a bill that would penalize local and state officials who help enforce so-called sanctuary policies.

The Libby Schaaf Act, named after the Oakland, Calif., mayor who earlier this year alerted residents about a planned immigration sweep, aims to prevent local officials from aiding immigrants in the country illegally.

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“I want lawless, Sanctuary City politicians to hear this message clearly: if you obstruct ICE [Immigration and Customs Enforcement], you are going to end up in the cooler,” King said in his announcement of the bill.

King, one of the most fervent opponents of immigration in Congress, said there was debate about the legality of Schaaf’s actions and his bill would get rid of any doubt about the law.

The Trump administration has been heavily opposed to sanctuary cities — cities that offer protections for immigrants in the country illegally — and 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 has said that Schaaf should be prosecuted.

Schaaf responded to Trump’s calls by saying that, “in Oakland, we are not obstructing justice. We are seeking it.”

ICE chief Thomas Homan and 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 have also petitioned the Justice Department to prosecute sanctuary city officials.

Earlier this year, the Justice Department sued California over alleged interference with federal immigration policies through its sanctuary laws.