Trump’s new coronavirus adviser has questioned masks and alarmed government scientists.

“Dr. Scott W. Atlas has argued that the science of mask wearing is uncertain, that children cannot pass on the coronavirus and that the role of the government is not to stamp out the virus but to protect its most vulnerable citizens as Covid-19 takes its course.

Ideas like these, both ideologically freighted and scientifically disputed, have propelled Dr. Atlas, a radiologist and senior fellow at Stanford University’s conservative Hoover Institution, into President Trump’s White House, where he is pushing to reshape the administration’s response to the pandemic.

Mr. Trump has embraced Dr. Atlas even as he upsets the balance of power within the White House coronavirus task force with ideas that top government doctors and scientists find misguided — even dangerous — according to people familiar with the task force’s deliberations.

That might be the point.

“I think Trump clearly does not like the advice he was receiving from the people who are the experts — Fauci, Birx, etc. — so he has slowly shifted from their advice to somebody who tells him what he wants to hear,” said Dr. Carlos del Rio, an infectious disease expert at Emory University. He was referring to Dr. Anthony S. Fauci, the country’s leading infectious disease scientist, and Dr. Deborah L. Birx, the White House coronavirus response coordinator”