President Biden has said none of his doctors have told him he has a serious medical condition. But his debate performance last month raised questions about his health and acuity.

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President Biden said in an interview released on Wednesday that he would re-evaluate whether to stay in the presidential race if a doctor told him directly that he had a medical condition that made that necessary.

Mr. Biden has said repeatedly that none of his doctors have told him he has a serious medical condition. Dr. Kevin O’Connor, the White House physician, wrote after the president’s physical in February that Mr. Biden is “a healthy, active, robust, 81-year-old male who remains fit to successfully execute the duties of the presidency.”

But his disastrous performance at a debate with former President Donald J. Trump last month, which prompted a wave of calls by Democratic allies to step aside, raised questions about his health and acuity.