One day after a medical issue forced Democratic presidential nominee Hillary Clinton to abruptly leave a 9/11 memorial event, Republican rival Donald Trump promised Monday to release the results of a recent physical examination.

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During an appearance on "Fox & Friends," Trump said he plans to release "very, very specific" details from a physical that he took last week.

"Hopefully they're going to be good – I think they're going to be good," he said. "I feel great."

Trump plans to release the information Thursday during a scheduled appearance on "The Dr. Oz Show," Fox News reported.

The move is likely to bolster calls for Clinton to release additional records amid fears that she is not healthy enough to sit in the Oval Office.

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"Something's going on, but I just hope she gets well and gets back on the trail and we'll be seeing her at the debate," Trump said. The first Trump-Clinton debate is scheduled for Sept. 26.

Clinton unexpectedly left a 9/11 commemorative event in Manhattan Sunday. Amateur video posted on social media showed her stumbling into a van.

Her doctor, Dr. Lisa R. Bardack, later said she had been diagnosed with pneumonia two days earlier.

>> Related: Hillary Clinton pneumonia diagnosis surfaces after falling at 9/11 memorial

Clinton was scheduled to travel to California on Monday and Tuesday, but the trip was canceled to allow Clinton more recovery time at her home in Chappaqua, New York.

Clinton spokesman Nick Merrill said in a statement that she will phone in to a fundraising event in San Francisco on Monday evening.

Trump and his supporters have been questioning Clinton's health for months. Her supporters have brushed off the criticism and attributed issues to Clinton's hectic schedule.