Three top Democrats wrote Trump administration officials on Monday asking for documentation on the White House plan to shuttle detained migrants to so-called sanctuary cities.

Reps. Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.), Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (D-Md.) and Bennie Thompson Bennie Gordon ThompsonHouse panel pans ICE detention medical care, oversight Senate to hold nomination hearing for Wolf next week Hillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers MORE (D-Miss.), chairmen of the House Judiciary, Oversight and Reform and Homeland Security committees, respectively, asked acting White House chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE and acting Secretary of Homeland Security Kevin McAleenan for all communications regarding the plan, which has been endorsed by President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE.

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"We are deeply troubled by multiple reports, recently confirmed by the President, that the Trump Administration is considering releasing detained immigrants into congressional districts represented by Democrats in a bizarre and unlawful attempt to score political points," wrote the chairmen.

"These reports are alarming. Not only does the Administration lack the legal authority to transfer detainees in this manner, it is shocking that the President and senior Administration officials are even considering manipulating release decisions for purely political reasons," they added.

White House officials twice floated the idea of sending Central American asylum seekers to "sanctuary cities" as a form of political retribution against Democrats, The Washington Post reported last week.

Administration officials first downplayed the report, which was based on information from whistleblowers and official emails, but Trump over the weekend doubled down on the idea.

"Those Illegal Immigrants who can no longer be legally held (Congress must fix the laws and loopholes) will be, subject to Homeland Security, given to Sanctuary Cities and States!" Trump tweeted Monday.

Those Illegal Immigrants who can no longer be legally held (Congress must fix the laws and loopholes) will be, subject to Homeland Security, given to Sanctuary Cities and States! — Donald J. Trump (@realDonaldTrump) April 15, 2019

U.S. border security officials have been forced to release migrants as the number of border crossings and apprehensions of family units seeking asylum have risen dramatically over the past three months.

The White House has used the crisis to argue against humanitarian regulations that limit how long minors can be detained, among other measures, saying Congress must act to change those laws and regulations or face an onslaught of illegal immigration.

Democrats vowed last week to investigate the White House over the plan to shuttle immigrants to sanctuary jurisdictions, which do cooperate with federal immigration authorities, although the plan has not been put in place.

"This reflects how much policymakers at the highest level of a government don't understand what they're dealing with," said Rep. Lou Correa Jose (Lou) Luis CorreaCriminalization that never should have been: Cannabis Man arrested, charged with threatening to attack Muslims in Germany Gloves come off as Democrats fight for House seat in California MORE (D-Calif.) Friday. "When they say they're going to punish 'sanctuary states,' don't they understand these workers are needed in this economy?"

The three House chairmen who penned Monday's letter wrote that the Trump proposal "appears to have been specifically designed to target Democratic districts."

"Not only does the Administration lack the legal authority to transfer detainees in this manner, it is shocking that the President and senior Administration officials are even considering manipulating release decisions for purely political reasons," wrote the chairmen.

--This report was updated at 12:38 p.m.