The mobilization comes after President Donald Trump fired Attorney General Jeff Sessions Wednesday, replacing him with a man who has previously criticized the probe and offered suggestions on how to slow it down.
"I don't know anything about (Whitaker)".
Republican Luther Strange, who was temporarily appointed to Sessions' seat, took to Twitter to encourage him to run. He looked close to tears as he was applauded by the staff on his way out of the justice department building on Wednesday night.
"Trump has done a naked attempt to mess with the investigation", she said.
"We've won the majority in the House, so, the days of just looking the other way are over", the California Democrat told MSNBC's "Morning Joe".
He also once tweeted a prosecutor's opinion piece that described the Mueller team as a "lynch mob", and wrote his own op-ed saying Mueller would be outside his authority if he investigated Trump's family finances. He questioned Deputy Attorney General Rod J. Rosenstein's ability to give Mueller such wide latitude and wanted to explore the bounds of what Mueller was examining, though Rosenstein kept Session's office "walled off" from the matter, this person said.
The Mueller investigation has so far produced 32 criminal charges and four guilty pleas from Trump associates.
CNN's Jim Acosta, who regularly spars with Trump and his spokeswoman Sarah Sanders, annoyed the president by asking if he'd demonised immigrants during the midterms election campaign and then went on to ask about the Russian Federation probe.
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I think he's earned the right to that cap over a period of over 10 years, six major tournaments and being our record goalscorer. I understand that has caused debate but for me it is a small way of appreciating what he has given to his country.
‘Fortnite’ partners with the National Football League to bring team jerseys, gliders, more
One of the main reasons the game has been such a resounding success is the innovation of Epic Games, the company behind Fortnite . This Ninja becomes more fearsome and energetic at night, and will become available in the Event Store on November 7 at 7 PM ET.
Sarri tells Moses he is free to leave Chelsea
It is not easy to play for Manchester City, Manchester United, Juventus. 'So he's becoming a very, very important player for us. But could he realistically challenge for the Premier League golden boot? It was clear in Naples, in the last season.
Jerry Role, a retired Department of Justice staffer told Al Jazeera that Trump's actions this week threatened the integrity of USA democracy.
The departure of Mr Sessions, who was the first United States senator to back Mr Trump's presidential run in 2016, was long expected, and came one day after Republicans lost control of the House of Representatives but boosted their Senate majority.
A spokeswoman for the Justice Department said that the acting attorney general - meaning Whitaker - is in charge of "all matters" within the department, including the Russian Federation probe.
Protests are scheduled to start Thursday at 5pm local time. A permanent replacement will be named at a later point, a second tweet from the president said. It undermines the rule of law.
Sessions, who likely suspected his ouster was imminent, was spotted by reporters giving some of his grandchildren a tour of the White House over the weekend.
Rosenstein, the deputy attorney general, took over supervision of the Russian Federation investigation. He did not mention that White House chief of staff John Kelly had called Sessions beforehand to ask for his resignation.
Sessions endured the name-calling in silence, even as he aggressively carried out the administration's conservative policies, such as stripping federal funding from so-called sanctuary cities and states and rescinding protection for young adults brought into the country illegally as children.
"I think Congress should regulate things that harm people, and that is the hard drugs and the like that dramatically hurt citizens, cause violent crime in our communities, and those should be regulated", he said.