BETHESDA, Md. (AP) — President Donald Trump's doctor is insisting that he is doing "very well" as he is treated for COVID-19 at a military hospital. But Navy Commander Dr. Sean Conley and other doctors raised more questions than they answered at a briefing. They left unclear whether the president has ever required supplemental oxygen. And Conley's assessment was contradicted by an account provided by a person familiar with Trump's condition. That person said some of Trump's vital signs over the past 24 hours were "very concerning" and that the next 48 hours will be critical in terms of his care. The person was not authorized to speak publicly and spoke to The Associated Press on condition of anonymity.