Donald Trump Mike Segar/Reuters Donald Trump revived his attacks on Hillary Clinton's health during a rally Thursday in Cincinnati, Ohio, suggesting again that his Democratic rival doesn't have the strength to serve as president.

Implying that, if Clinton were to fall in China, no one would help her.

"When she's over in China, if she goes down, in Tiananmen Square, they'll just leave her there," the Republican nominee told the crowd.

Trump called Chinese "tough people" who would not help Clinton up if she fell down, and continued, "They'll say 'Let her come up when she's ready.'"

Trump has repeatedly stoked theories about Clinton's health, which grew into an international story after the former secretary of state became overheated and was seen stumbling after leaving a September 11th memorial service last month. The Manhattan mogul portrayed Clinton as a powerless leader in a recent TV ad, among numerous attacks questioning whether she has the "stamina" to serve in the White House.

Clinton fired back at Trump during the first presidential debate:

“As soon as he travels to 112 countries and negotiates a peace deal, a cease fire, a release of dissidents, an opening of new opportunities in nations around the world, or even spends 11 hours testifying in front of a congressional committee, he can talk to me about stamina.”

Clinton's doctor released a follow-up statement in September showing that Clinton is in good health and physically fit to serve as president.