Former Sen. Gordon Humphrey (R-NH) said on Thursday that because he thinks Donald Trump is a “sociopath” he may wind up voting for Hillary Clinton in November.

“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,” Humphrey told NBC News in an email. “To imagine Trump in charge of our armed forces at a moment of crisis is frightening.”

Though Humphrey is no fan of Trump, he indicated that he’ll only cast a vote for Clinton if it looks like Trump has a chance.

“I would only vote for Hillary in the event of a very close contest,” Humphrey told NBC News. “Meantime, I’m hoping the Republican leadership, at long, long last will show the courage and principal to denounce Trump and to demand he renounce the nomination or face a reconvening of the convention.”

As NBC News noted, Humphrey was part of a last-ditch effort to keep Trump from securing the nomination as a delegate at the Republican convention in Cleveland.

His new comments come as several reports revealed that RNC Chair Reince Priebus and members of the Trump campaign are concerned about Trump’s latest comments. The Republican nominee’s relentless attacks on the parents of a Muslim American soldier earned him rebukes from members of his own party. And his surrogates expressed concern over his hesitance to endorse House Speaker Paul Ryan (R-WI) in his primary.