Trump's presidency will be on a downward spiral if he removes Attorney General Jeff Sessions from the Justice Department, Sen. Dianne Feinstein said Tuesday.

"Jeff Sessions has done nothing to deserve termination. I don't always agree with him, that's true. But I really disagree using him as a political pawn," the ranking Democrat on the Senate Judiciary Committee told MSNBC.

Trump is reportedly considering Sessions to lead the Department of Homeland Security now that former secretary John Kelly has become the White House chief of staff.

Feinstein said the president has the authority to transfer Sessions to Homeland Security, but it would be crossing a line if the shift is meant to stop special counsel Robert Mueller's investigation into Russia's interference in the 2016 election.

"It could well be the beginning of the end of this short presidency. I don't want that to be the case. This is the red zone. No president should enter it without knowing fully what the repercussions are," Feinstein said.

White House press secretary Sarah Sanders told reporters Monday: "There are no conversations about any Cabinet members moving in any capacity."