Ex-GOP senator: Trump's a sociopath
© Greg Nash

Former Sen. Gordon Humphrey (R-N.H.) says he is considering voting for Hillary ClintonHillary Diane Rodham ClintonHillicon Valley: Trump pushes to speed up 5G rollout | Judge hits Roger Stone with full gag order | Google ends forced arbitration | Advertisers leave YouTube after report on pedophile ring 4 ways Hillary looms over the 2020 race Hillary Clinton met with Biden, Klobuchar to talk 2020: report MORE over "sociopath" Donald TrumpDonald John TrumpSchiff urges GOP colleagues to share private concerns about Trump publicly US-China trade talks draw criticism for lack of women in pictures Overnight Defense: Trump to leave 200 troops in Syria | Trump, Kim plan one-on-one meeting | Pentagon asks DHS to justify moving funds for border wall 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 BassKaren Ruth BassWhitaker takes grilling from House lawmakers Congressional Black Caucus leaders call on Northam to resign Congressional Black Caucus faces tough decision on Harris, Booker 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.