De Blasio vows to take Trump to court over sanctuary city proposal

New York City Mayor Bill de Blasio (D) said Monday that he will fight President TrumpDonald John TrumpWhat the Mueller report tells us about Putin, Russia and Trump's election Fox's Brit Hume fires back at Trump's criticism of the channel Anti-US trade war song going viral in China MORE in court over Trump's plan to send undocumented immigrants to so-called sanctuary cities like New York.

"It’s illegal. It is just plain illegal. We will meet him in court. We will beat him in court," de Blasio said in an interview with NY1.

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"I remember vividly the day early in the Trump administration when he said he was going to cut our security funding because we did not ask for documentation status, because we would not cooperate with everything ICE was doing," he continued.

"We said we would go to court to stop him and we did. So this is just patently illegal. We'll stop it."

Trump argued Saturday that he has the legal right to send migrants to sanctuary cities — areas where local authorities refuse to help federal officials in enforcing immigration laws. The administration had previously denied such a plan was being floated.

"The USA has the absolute legal right to have apprehended illegal immigrants transferred to Sanctuary Cities," Trump tweeted. "We hereby demand that they be taken care of at the highest level, especially by the State of California, which is well known or its poor management & high taxes!"

He doubled down on the plan Monday, tweeting that "Illegal Immigrants who can no longer be legally held ... will be, subject to Homeland Security, given to Sanctuary Cities and States!"

Democratic Reps. Jerrold NadlerJerrold (Jerry) Lewis NadlerDemocrats are running out of stunts to pull from impeachment playbook Trump asks if Nadler will look into Clinton's 'deleted and acid washed' emails Trump tweets conservative commentator's criticism of FBI director MORE (N.Y.), Elijah CummingsElijah Eugene CummingsOn The Money: Judge upholds House subpoena for Trump financial records | Trump vows to appeal ruling by 'Obama-appointed judge' | Canada, Mexico lift retaliatory tariffs on US | IRS audit rate falls House Oversight Committee requests information on reported Trump plan to send TSA employees to border Judge upholds House panel subpoena for Trump financial records MORE (Md.) and Bennie ThompsonBennie Gordon ThompsonHillicon Valley: Trump takes flak for not joining anti-extremism pact | Phone carriers largely end sharing of location data | Huawei pushes back on ban | Florida lawmakers demand to learn counties hacked by Russians | Feds bust 0M cybercrime group Trump takes flak for not joining anti-extremism pact Huawei officials say they would 'welcome' US ban on tech posing national security risk MORE (Miss.), chairmen of the House Judiciary, Oversight and Reform, and Homeland Security committees, respectively, slammed the proposal on Monday as "bizarre and unlawful" in a request for documents regarding the plan.

Trump first said last week that he was "giving strong considerations" to the plan despite officials saying that the idea was never seriously considered.