For months, House Minority Leader Nancy Pelosi and other Democratic leaders have privately counseled their more militant members to forswear talk of impeaching President Trump, telling them the political support for such a step simply doesn’t exist in the GOP-controlled Congress.

But 25 House Democrats, including the ranking member of the House Judiciary Committee, are now pushing an equally radical alternative: They are backing a bill that 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.

At 12:56 p.m. Thursday, barely four hours after Trump tweeted attacks against MSNBC cable host Mika Brzezinski in crude, personal terms, Rep. Jamie Raskin, D-Md., the chief sponsor of the bill, sent out an email to his colleagues, urging them to get behind the measure, writing it was of “enduring importance to the security of our nation.”

“In case of emergency, break glass,” Raskin told Yahoo News in an interview. “If you look at the record of things that have happened since January, it is truly a bizarre litany of events and outbursts.” Asked if Trump’s latest tweets attacking Brzezinski and her co-host Joe Scarborough — which were roundly condemned by members of both parties as beneath the dignity of his office — strengthened the grounds for invoking the 25th Amendment, Raskin replied: “I assume every human being is allowed one or two errant and seemingly deranged tweets. The question is whether you have a sustained pattern of behavior that indicates something is seriously wrong.” After Trump’s Thursday morning tweets, four more Democrats signed on to Raskin’s bill, his office said Friday. (Brzezinski and Scarborough’s response to Trump’s tweets ran in today’s Washington Post under the headline, “The President is not well.” White House spokeswoman Sarah Huckabee Sanders defended Trump’s tweets Thursday, saying he “fights fire with fire.”)

To be sure, even Raskin acknowledges Congress and the country are in largely uncharted waters. The 25th Amendment was adopted in 1967 in response to the assassination of President John F. Kennedy and past presidential medical crises — including the heart attacks of Dwight Eisenhower and the illnesses of Franklin D. Roosevelt and Woodrow Wilson — to deal with instances where presidents become incapacitated and unable to perform the duties of their office.

One of its provisions, known as Section 4, empowers the vice president along with a majority of the Cabinet to make a determination that a president is “unable to discharge the powers and duties” of the office, and then provide it in writing to Congress, resulting in the president’s removal. It’s a step that has never been taken.

But Raskin, a former constitutional law professor, has seized on some largely overlooked language in Section 4 as the basis for his bill. It turns out it doesn’t have to be the Cabinet that makes a finding of presidential incapacity. The section also permits “such other body as Congress may by law provide” — along with the vice president — to reach the same conclusion.

Yet in the 50 years since the 25th Amendment took effect, Congress has never set up such a body. Raskin’s bill would do so. It calls for the creation of an “Oversight Commission on Presidential Capacity.” The commission would be a nonpartisan panel appointed by congressional leaders composed of four physicians, four psychiatrists and three others — such as former presidents, vice presidents or other former senior U.S. government officials. The commission, if directed by Congress through a concurrent resolution, would be empowered to conduct an examination of the president “to determine whether the president is incapacitated, either mentally or physically.”