Washington DC: Top Democratic leaders have unleashed a blistering offensive against United States President Donald Trump’s decision to elevate adviser Stephen Miller to White House Chief of Staff, framing the appointment as an "act of vengeance" following the administration's bruising midterm election defeats.

Lawmakers and state executives across the party united in fierce condemnation of the move, accusing the White House of installing the architect of aggressive deportation policies at the centre of executive power in direct defiance of the electorate.

Leading the charge, Indian-American Congressman Ro Khanna labelled the elevation a deliberate retaliatory strike against immigrant communities who voted heavily against the administration.

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"Stephen Miller is the architect of Trump’s rogue immigration policy. Appointing him Chief of Staff is an act of vengeance against the millions of Latinos who came out to call for abolishing ICE," Khanna wrote on social media platform X.

Warning of aggressive scrutiny from Capitol Hill, Khanna added, "No matter what position Miller holds, House Democrats will hold him accountable."

California Governor Gavin Newsom also denounced Miller as a dangerous extremist whose appointment insults the democratic mandate delivered on election night.

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"Donald Trump just promoted one of the most vile thugs to ever slither into the Oval Office," Newsom posted. "This is an insult to every American who voted for change on Tuesday. Stephen Miller cooked up the sadistic mass deportation regime that ripped apart families and trampled basic civil rights. Innocent people are dead because of him. Voters rejected his cruelty and extremism. This is sick."

From the Senate, Democratic Leader Chuck Schumer warned that the incoming Democratic majorities in Congress would relentlessly confront Miller at every turn.