House Speaker Nancy Pelosi openly questioned President Donald Trump’s fitness to remain in office Thursday, suggesting a staff or family “intervention” for the good of the nation after his dramatic blow-up at a White House meeting with Democrats. Trump responded by calling her “crazy.”

“She’s a mess,” Trump told reporters at an afternoon news conference in which he lined up White House staff to testify to his calmness at a meeting with Pelosi and Senate Democratic Leader Charles Schumer. “Cryin’ Chuck, Crazy Nancy … I watched Nancy and she was all crazy yesterday,” he claimed.

As for himself, he declared, “I’m an extremely stable genius.”

Both the Republican president and Democratic leaders dug in a day after Trump stalked out of the Cabinet Room demanding an end to all congressional probes before he would work with Congress on crumbling U.S. infrastructure and other matters.