Democratic Rep. Ilhan Omar called White House adviser Stephen Miller a 'white nationalist' over a report he pushed President Donald Trump toward a harder line on immigration - a move that resulted in a massive shakeup in the Department of Homeland Security.

'Stephen Miller is a white nationalist. The fact that he still has influence on policy and political appointments is an outrage,' she wrote on Twitter.

She linked to an article on Splinter reporting that Miller, an anti-immigration hardliner who was the architect of the president's travel ban, pushed Trump to retracted his nomination of Ron Vitiello to lead U.S. Immigration and Customs Enforcement.

Democratic Rep. Ilhan Omar called White House adviser Stephen Miller a 'white nationalist'

She cited a report that Stephen Miller, who is known as an anti-immigration hawk, pushed Trump toward a harder line on the issue

'WHITE NATIONALIST' - OMAR'S ACCUSATION EXPLAINED Democratic congresswoman Ilhan Omar's description of Stephen Miller as a 'white nationalist' puts him - in her view - in the same broad field as the KKK and marchers in Charlottesville in 2017. White nationalism is intended to suggest that Miller sees white people as one race and that the U.S.A. is a white country which will not benefit from the arrival of non-white immigrants. The term has been used interchangeably with 'white supremacism,' the belief that the white 'race' is better than others. But academics who study the field have drawn a distinction between nationalism and supremacism, so Omar is not necessarily making an accusation that Miller is an outright white supremacist. More complicatedly, Miller is Jewish, and white nationalism has usually gone hand-in-hand with anti-Semitism. But some white nationalists have recast the 'white race' as including Jewish people, among them Jared Taylor, seen as a key thinker in the movement. Advertisement

Miller was also reported to be the driving force behind the administration's policy last year of separating migrant children from their parents who illegally crossed the border.

But the withdrawal of Vitiello set off a chain reaction that led to Department of Homeland Security Secretary Kirstjen Nielsen's resignation on Sunday night.

Trump said he withdrew Vitiello's name because he wanted someone 'tougher' to lead the top immigration enforcement agency.

'We're going in a little different direction,' he said on Friday. 'Ron's a good man, but we're going in a tougher direction.'

Miller is 'particularly adept,' one administration official told The Washington Post, at placing blame on others when his ideas don't work.

Nielsen reportedly was not given a head's up last week when the White House retracted Vitiello's name.

Her meeting with the president Sunday night was reported to be about Vitiello. Her being blindsided by the White House dropping him, in addition to the ongoing immigration crisis, prompted her to resignation.

Trump followed Nielsen's ouster with more pink slips Monday, axing the director of the U.S. Secret Service Randolph 'Tex' Alles.

U.S. Citizenship and Immigration Services Director Lee Cissna is also leaving, according to CBS News. So are DHS undersecretary for management Claire Grady and general counsel John Mitnick.

A person with knowledge of USCIS's front office, however, said late Monday that Cissna was still in his job. And Alles told his agency's staff that he wasn't forced out.

Stephen Miller was behind Trump's travel ban

Department of Homeland Security Secretary Kirstjen Nielsen met with President Donald Trump Sunday evening and submitted her resignation

Nielsen reportedly was not given a head's up on Thursday when the White House retracted its nomination of Ron Vitiello to lead U.S. Immigration and Customs Enforcement

Shoving Alles overboard and driving others out signals the growing authority of Miller, the 33-year-old former staffer to then-Sen. Jeff Sessions. Alles, Cissna, Grady and Mitnick were on a list of officials Miller targeted for removal as 'too soft,' according to a White House official.

A White House source with knowledge of the West Wing's goings on in the past week told DailyMail.com on Monday that Miller had advocated internally for Nielsen's firing, and for Alles to follow her out the door.

Miller is known as a sharp-tongued promoter of hawkish immigration policies that Democrats have complained push the boundaries of federal law and too often challenge court precedents.