Much of the commentary about Mr. Whitaker's appointment has focused on all sorts of technical points about the Vacancies Reform Act and Justice Department succession statutes.
More than 100 people showed up to the Tippecanoe County courthouse to protest in response to President Trump's firing of Attorney General Jeff Sessions, Thursday.
The FBI has launched a criminal investigation into a company which President Trump's new Acting Attorney General, Matthew Whitaker, was paid to serve on as a board member.
"I'm confident that Mr. Mueller will be allowed to do his job without interference", Graham said, adding: "You don't recuse somebody because they have opinions different than the people they're overseeing".
Trump had been aware before appointing him that Whitaker was a skeptic of the Mueller probe, which factored into the decision to tap him over Deputy Attorney General Rod Rosenstein, two White House advisers told The Washington Post.
Rep. Jerry Nadler, D-N.Y., the incoming chairman of the House Judiciary Committee, described Trump's appointment of Whitaker as "an attack" on the Mueller investigation and said protecting that probe will be his committee's top priority. "Mr Whitaker needs to understand that he will be called to answer".
"Look, I believe there will be enough of our Republican colleagues who will join us".
If Whitaker doesn't recuse, Schumer said congressional Democrats will "attempt to add to must-pass legislation, in this case the spending bill, legislation that would prevent Mr. Whitaker from interfering with the Mueller investigation". "He has already talked about ways to strangle the Mueller investigation, such as cutting off their funding". In addition, Mr Whitaker is also a close friend of Donald Trump's 2016 election campaign co-chair Sam Clovis.
"He's been the chief of staff to a recused attorney general", she said.