Brand was sworn in as associate attorney general on May 22.
"If President Trump were to try to replicate [former President Richard] Nixon's Saturday Night Massacre by firing Deputy Attorney General Rod Rosenstein in addition to Mueller, Congress must unite to stop him - without respect to party, and for the sake of the nation", he said.
Dianne Feinstein, top Democrat on the Senate Judiciary Committee, said she was "increasingly concerned" that Trump will fire both Mueller and Rosenstein.
I think he's furious.
Comey's assurances to Trump for a second and third time could not change Baker's views. The Washington Post report suggests that scrutiny has been folded into the special counsel office and includes Kushner's business dealings, though it offers no details on what that scrutiny is.
The development comes a day after the daily reported that Mueller had extended his probe into determining whether the President tried to obstruct justice by suggesting to top intelligence and law enforcement officials that they end the Russian Federation investigation. ABC was the first to report the news.
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A White House official told CNN the tweets were less spontaneous than a strategy by the President of "taking matters into his own hands". Schiff cited the fact that the president at one meeting "cleared the room" of advisers and asked to speak to Comey alone.
The transition official spoke on condition of anonymity because the person was not authorized to discuss post-election decisions publicly.
On Thursday night, he issued a statement lashing out at news stories sourced to anonymous officials and that he believes are causing the President and Republicans to attack the Justice Department, the Federal Bureau of Investigation and Mueller for alleged leaks.
As Mueller assembles his investigative team, statements by Trump's friend Christopher Ruddy this week set off new questions.
Another White House official told the Daily Beast it would "suicide" for Trump to get rid of the special counsel. Former [FBI] Director [Robert] Mueller has hired 13 lawyers.
The Justice Department's investigation into Russian involvement in the 2016 election is looking at Kushner's multiple roles in the Trump administration, including the Trump campaign's 2016 data analytics operation; his relationship with former national security adviser Michael Flynn; and Kushner's own contacts with Russians, according to United States officials briefed on the probe. And Trump himself took aim at the senior Justice Department official responsible for appointing Mueller, accusing him on Twitter of leading a "Witch Hunt".
Rosenstein earlier this month confirmed he had the ultimate authority to hire or fire Mueller, but said he has been given a wide berth to conduct the probe.
The Trump tweets come after the top lawyer for his transition team warned organization officials to preserve all records and other materials related to the Russian Federation probe. While the Trump administration initially said that letter was the reason the president fired Comey on May 9, Trump later said he did so because of the "Russia thing".
The memo instructed aides and volunteers Thursday to save the documents related to Russia, Ukraine and several campaign advisers: Paul Manafort, Carter Page, Roger Stone, Rick Gates and Michael Flynn, according to the report.