That would leave Brand, the associate attorney general, in charge of a probe that now has Trump squarely in its crosshairs.
Brand, who was confirmed by the Senate on May 18, has experience in both the public and private sides of Washington. Mueller also has expansive powers to investigate any matters that develop from his initial investigation.
Was the Rosenstein memo the reason Comey was sacked?
Next week's witnesses include officials from the Federal Bureau of Investigation and the Department of Homeland Security, election officials, and an expert on election security.
Richard Painter, who served as President George W. Bush's chief ethics lawyer from 2005 to 2007, told The News it wasn't a slam-dunk that Trump's latest tweet would help the building of potential obstruction justice case against Trump - but he said it definitely wouldn't help Trump either. Still, the snowballing investigation has deeply angered Trump, who denies he has any nefarious ties to Russian Federation. They are Paul Manafort, Trump's former campaign manager; Rick Gates, Manafort's business partner; Carter Page, a former foreign policy adviser; Flynn; and Roger J. Stone Jr., an informal adviser to Mr. Trump. The official demanded anonymity because the official was not authorized to be named discussing the deliberations.
Considering that Trump strong-armed Rosenstein into writing a letter about Comey's performance in the first place - a letter that never actually recommended the ex-FBI director's firing - and that Rosenstein didn't know POTUS would use the letter as his justification for the decision, it's easy to see how dude would be annoyed.
A White House spokesman referred a request for comment on Friday's tweets to the president's legal team.
In recent weeks, there has been a lot of reporting that Trump has grown frustrated that there is a "Russia cloud" hovering over his presidency and wants to find a way to remove it. Rosenstein, the official who would be responsible for dismissing Mueller, told USA lawmakers he would fire him only with good cause.
"He's already admitted publicly himself that he'd already chose to fire Comey and has also said he did so to end the Russian Federation investigation", Akerman said, pointing to an interview Trump did with NBC News' Lester Holt last month.
In a series of tweets on Thursday, the president repeated his assertion that Mueller's investigation into Russian interference in the 2016 campaign is a "WITCH HUNT" based on the "phony" premise of possible collusion between Russia and a team of Trump campaign associates.
Hours after Mr Trump's tweet, a source close to his outside legal team said the President did not intend his tweet to be confirmation of the investigation but rather was a reaction to a Washington Post story about the probe from Wednesday (local time). He also seemingly attacked the deputy attorney general, a man he appointed just a few months ago.
The Labor Department this month that the jobless rate fell to 4.3 percent the lowest level since 2001, from 4.4 percent.
"I will say candidly the president and federal government generally, I think, would be better off generally with fewer tweets", said Sen.
Trump is an avid user of Twitter, with over 32 million followers on his personal account and more than 18 million people on the official presidential account. Manafort, Page and Stone have also been linked to the Russian Federation investigations.
But he has so far refused to curtail his social media postings.