Nadler wants 'the boss of everybody' Stephen Miller to testify before Congress

House Judiciary Committee Chairman Jerrold NadlerJerrold (Jerry) Lewis NadlerTim Ryan doesn't back impeachment proceedings against Trump 4/20: Will Congress advance marijuana legislation in 2019? Trump accuses 'fake news media' of 'doing everything possible to stir up anger' after Mueller report MORE (D-N.Y.) said Sunday that he wants White House adviser Stephen Miller to testify before Congress over controversial immigration proposals, suggesting Miller is pulling the strings behind the scenes.

“Probably Stephen Miller, who seems to be the boss of everybody on immigration, ought to come before Congress and explain some of these policies," Nadler said on CNN's "State of the Union."

President TrumpDonald John TrumpThorny part of obstruction of justice is proving intent, that's a job for Congress Obama condemns attacks in Sri Lanka as 'an attack on humanity' Schiff rips Conway's 'display of alternative facts' on Russian election interference MORE confirmed Friday a proposal is under consideration to send detained immigrants to “sanctuary cities."

The Washington Post reported it was considered as a way to retaliate against Democrats.

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Miller was reportedly heavily involved in formulating the plan, which was repeatedly rejected by immigration officials.

Nadler has said the plan is "both morally repugnant and probably illegal."

Trump has praised Miller, but denied that he is behind the administration's immigration policy.

“Frankly, there’s only one person that's running it," he said last week. "You know who that is? It's me."

Trump has indicated he will double down on his hard-line positions on immigration by overseeing changes at the Department of Homeland Security that forced the departure of many of the agency’s upper echelon, including Secretary Kirstjen NielsenKirstjen Michele NielsenOvernight Energy: Mueller report reveals Russian efforts to sow division over coal jobs | NYC passes sweeping climate bill likened to 'Green New Deal' | EPA official says agency may ban asbestos | Energy Dept. denies Perry planning exit The Hill's 12:30 Report: Inside the Mueller report Energy Dept denies report that Rick Perry is planning to leave Trump admin MORE