Four more House Democrats have signed on to a bill to begin impeachment proceedings against President Trump after his Twitter rampage against MSNBC host Mika Brzezinski.

Yahoo News reported Saturday that 25 House Democrats are now working on the bill, which has been in the works since April. The bill's primary sponsor is Rep. Jamie Raskin (D-Md.).

The bill would create a congressional “oversight” commission that could declare the president incapacitated, leading to his removal from office under the 25th Amendment to the U.S. Constitution.

After Trump's tweets on Thursday, Raskin sent out an email to colleagues urging support for his bill.

“In case of emergency, break glass,” Raskin told Yahoo News. “If you look at the record of things that have happened since January, it is truly a bizarre litany of events and outbursts.”

Raskin said that Trump's tweets show a pattern of instability that means he is unfit for office.

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“I assume every human being is allowed one or two errant and seemingly deranged tweets," Raskin said. "The question is whether you have a sustained pattern of behavior that indicates something is seriously wrong.”

The bill's supporters include former Democratic National Committee Chairwoman Debbie Wasserman Schultz (D-Fla.) and ranking Democrat on the House Judiciary Committee John Conyers Jr. (D-Mich.).

Raskin concluded by warning that Trump's instability in the White House was only going to get worse.

“The question is, where are we going to be six months, 12 months, 18 months from now?" Raskin asked.

"The presidency is considered extremely stressful for people with the strongest mental health. We need to be prepared for all eventualities.”