WASHINGTON (AP) — President Donald Trump had another medical exam on Tuesday, putting his health under renewed public scrutiny after he has worked to dismiss concerns over his age and stamina.

The 79-year-old president spent more than three hours at Walter Reed National Military Medical Center for what the White House described as preventive medical and dental checkups. It was Trump’s fourth publicly disclosed medical exam since he returned to office for a second term, and it comes as he tries to project strength ahead of midterm elections that will test his sway with voters.