Donald Trump's longtime doctor has been sued three times for malpractice, raising more questions about the man who has vouched for the health of the Republican presidential nominee.

Two of the lawsuits charge that Harold Bornstein overmedicated patients, leading to their deaths, according to past lawsuit documents reviewed by the Daily Beast. Bornstein settled both of them before they went to a jury trial.

In one of the malpractice suits, Bornstein paid $86,250 in 2002 to the husband of a former patient, who said Bornstein "was negligent, careless and unskilled in failing to properly diagnose" his wife, Janet Levin. Kenneth Levin also claimed Bornstein prescribed Janet powerful, unneeded medications, including highly addictive prescription painkillers.

In another malpractice case in 2000, Lorraine Pollifrone said Bornstein "improperly medicated" her husband, causing his death during a colonoscopy.

Bornstein, who has served as Trump's gastroenterologist since 1992, issued a brief, four-paragraph letter last year saying the 70-year-old billionaire is in "extraordinary" health and suggesting he could be the healthiest president in history, if elected.

Trump's opponent, Democratic presidential nominee Hillary Clinton, has released more details about her health. But while she has stayed away from attacking Trump about his health, Trump and his staffers have spread rumors that Clinton is trying to hide medical problems.