Former GOP rep: Trump's mental health 'a grave conversation'

Former Rep. David Jolly (R-Fla.) on Monday said the national discussion about President TrumpDonald John TrumpConservatives express concern over House GOP immigration bill Poll: McSally holds 14-point lead in Arizona GOP Senate primary Trump defends Nielsen amid criticism over family separations MORE's mental stability is a "grave conversation" that is "challenging for the country."

"This is a very grave conversation. It has been over 30 years since this nation had a conversation about whether or not our president was fit to serve," Jolly told host Nicole Wallace on MSNBC's "Deadline White House." 

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His remarks come after a new White House tell-all by Michael Wolff, titled "Fire and Fury: Inside the Trump White House," claimed "every" White House staffer questions the president's mental health. Trump on Saturday tweeted in his defense that he is a "very stable genius," further fueling the discussion.

"There's an axiom in politics ... if you're explaining, you ain't campaigning," Jolly told Wallace.

"If you are talking about the president's mental fitness, you are not on message regarding his agenda nor the interest of the country," he added.

Jolly, who lost his reelection bid in November to former Gov. Charlie CristCharles (Charlie) Joseph CristThe Hill's Morning Report: As Trump talks, his lawyers sweat Inviting disaster: Ignoring the lessons learned from Deepwater Horizon Former Florida congressmen mull bipartisan gubernatorial run: report MORE (D), has repeatedly blasted Trump for exhibiting "risky behavior," complaining about GOP lawmakers and creating chaos for the Republican party.

The former lawmaker indicated in October that he preferred Democrats take the House in the midterm elections to serve as a great check against the president's power.

"There is no discernible Republican ideological agenda that is worth fighting for right now," Jolly said.

"But we do know that we have a president who very well might put this nation at risk, and this Republican Congress has done nothing to check his power. Democrats could [be a check], and we might be better off as a republic if they take the House in 2018," he said on MSNBC.

In a Sunday tweet, Jolly suggested he would vote for Oprah Winfrey if she ran in 2020 over Trump and Vice President Pence.