Former Sen. Gordon Humphrey (R-N.H.) says he is considering voting for Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE over "sociopath" Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE.

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Humphrey, who served in Congress from the ‘70s to 1990, told NBC News on Thursday he is confident that Trump has major psychological issues, and said that the prospect of the Republican becoming the commander in chief is "frightening."

"I am ever more confirmed in my belief that Trump is a sociopath, without a conscience or feelings of guilt, shame or remorse. And he is pathologically insecure, recklessly attacking anyone who does not confirm him as the best there is," he wrote in an email to the news network.

"To imagine Trump in charge of our armed forces at a moment of crisis is frightening," Humphrey added.

It’s not the first time he’s leveled the accusation at the GOP nominee, telling the New Hampshire Union Leader in May: “Unequivocally, I am not supporting Donald Trump. I think he’s a sociopath.”

But on Thursday, he said he may vote for Clinton, the Democratic nominee; he supported Ohio Gov. John Kasich in the Republican primaries.

"I would only vote for Hillary in the event of a very close contest," Humphrey said.

"Meantime, I'm hoping the Republican leadership, at long, long last will show the courage and principal [sic] to denounce Trump and to demand he renounce the nomination or face a reconvening of the convention."

Many top Republicans have condemned Trump's recent attack on family members of Muslim U.S. soldier Humayun Khan, who was killed fighting in the Iraq War in 2004.

On Wednesday, Rep. Karen Bass Karen Ruth BassPatients are dying unnecessarily from organ donation policy failures Hispanic caucus report takes stock of accomplishments with eye toward 2021 Bogeymen of the far left deserve a place in any Biden administration MORE (D-Calif.) launched a petition calling for Trump to undergo mental health evaluation.

The petition received more than 11,000 signatures in 24 hours.