WHITE PLAINS, N.Y. — Hillary Clinton returned to the campaign trail today following a bout of pneumonia that sidelined her for three days and revived questions about both the Democratic nominee and Republican Donald Trump’s transparency regarding their health.

Clinton’s campaign responded with a new letter from her doctor Wednesday declaring her “fit to serve” as president and recovering well from her recent illness. The letter — the first substantial update on her health in more than a year — details the medications she is taking, her cholesterol levels and other results from a physical exam.

Trump says he, too, plans to release details from a recent physical, though it’s unclear when that will happen and how much information he will provide.