Clinton Hits Back at Trump's Questions About Her Stamina Hillary Clinton tells ABC's David Muir that she is "now in full campaign mode"

[EXCLUSIVE]

After a month dominated by 35 private fundraisers and few public campaign events, Hillary Clinton fired back at Donald Trump's questions about her stamina in an interview with ABC's David Muir -- saying her team "came out of that convention with an enormous amount of energy and enthusiasm."

"No. Not at all," Clinton said when asked if she were being out-campaigned by her Republican rival.

"We are now in full campaign mode. All the way to and through Election Day. And I feel very good about the organization we’ve built," Clinton told Muir alongside her running mate, Tim Kaine, in Cleveland, Ohio.

Trump made roughly 20 stops in August and said recently that the former secretary of state doesn't look presidential or have the drive or stamina to do the job -- a remark Kaine called "idiotic."

"I got added to this ticket about 11, 12 weeks, 100 days from the election. This great public servant has been on the field for 17 or 18 months it’s hard to keep up with her," said the Virginia Senator. "The day he tweeted out 'Hillary didn’t come to Mexico, does she have the energy.' She was here in Ohio talking to the American legion."

Trump and his surrogates have questioned Clinton's health for months. In a recent appearance on Fox News, former New York mayor Rudy Giuliani encouraged viewers to search for "Hillary Clinton illness" online. Trump is 70-years-old and Clinton is 68. Both candidates have released medical letters from their physicians saying they are in good health.

"What we have released is commensurate with what others who have been nominated for president have release. And we followed closely what the format was, we put out the information. We now have the doctor who signed his letter basically saying he did it in five minutes, because the 'limousine was waiting.' It is devoid of information," said Clinton, referring to recent comments from Trump's doctor, Harold Bornstein.

In an interview with NBC News, Bornstein claims he wrote Donald Trump's medical letter in 5 minutes while a limo sent by Trump waited outside his Manhattan office.

On Monday at the Cleveland Hopkins International Airport, Clinton's plane parked next to Trump's as both candidates campaigned in the battleground state of Ohio. "Just shows you how important Ohio is. We're gonna be here a lot," Kaine told reporters.