Donald Trump continued to raise questions about Hillary Clinton's health on Sunday, challenging the Democratic presidential nominee in a tweet to release "detailed medical records."

Clinton has withstood two weeks' worth of health-related attacks from her Republican rival and conservative pundits and websites. Earlier this month, Trump claimed in multiple speeches that Clinton lacked the "mental and physical stamina" required of the presidency.

Clinton laughed off the assertion in an appearance on "Jimmy Kimmel Live" last week, and she later dismissed Trump's comments as a "paranoid fever dream."

Trump's own medical history has come under renewed scrutiny this week after Harold Bornstein, the physician who gave a glowing assessment of Trump's health in December, revealed to NBC News that he wrote his letter in five minutes and purposely imitated the candidate's rhetorical style.

Clinton's physician, Lisa Bardack, released a public letter last year summarizing Clinton's health, writing that she was "in excellent physical condition and fit to serve as President of the United States."