Hillary Clinton on Friday took square aim at Donald Trump’s refusal to commit to accepting the November election’s results, comparing Trump’s rhetoric to that of world leaders who jail dissidents and invalidate elections.

“On Wednesday night, Donald Trump did something no other presidential nominee has ever done. He refused to say that he would respect the results of this election. Make no mistake, by doing that, he is threatening our democracy,” Clinton said at a rally in Cleveland.

“If you lose an election—and I have lost an election—you don’t feel very good next day, do you?” she added. “But we know in our country the difference between leadership and dictatorship, right?”

Clinton said Trump’s promise at Wednesday night’s presidential debate to keep the American people “in suspense” over whether he would accept the final electoral tally was an affront to the peaceful transition of power, “one of the things that sets us apart.”

“It is how we hold our country together no matter who is in charge,” Clinton said.

“I went to 112 countries as your Secretary of State and I saw the difference between what we do and what others do,” she said. “I was in countries where people jail their political opponents or execute them or exile them or invalidate elections that they didn’t win. That can never be allowed to happen here.”