President Trumps resolve may be cracking at least when it comes to face masks.

On Monday, Trump tweeted TWTR, +0.37% a photo of himself wearing a mask with a presidential seal, writing, Many people say that it is Patriotic to wear a face mask when you cant socially distance. CNN T, +1.22% reported that the presidents falling poll numbers likely played a role in his latest decisions to wear a mask and resume his daily 5 p.m. update on the coronavirus pandemic.

On April 3, the Trump administration and the Centers for Disease Control and Prevention reversed their policies on face masks and said all Americans not, as they previously said, just medical workers should wear cloth face coverings. As of Tuesday, COVID-19 had claimed at least 140,909 lives in the U.S. and infected at least 3.8 million people.

Unlike New York Mayor Bill de Blasios mandate to wear masks in stores, however, the federal governments recommendations are voluntary. Whats more, Trump at the time signaled his resistance to wearing a mask. I dont think Im going to be doing it, he said. Wearing a face mask as I greet presidents, prime ministers, dictators, kings, queens I just dont see it.

During an interview on Fox News on Sunday, journalist Chris Wallace asked Trump if he would introduce a federal mandate to wear face masks in public places where social distancing is not possible. No, I want people to have a certain freedom, Trump replied. I dont agree with the statement that if everyone wears a mask everything disappears.

Asked if he took responsibility for not having a federal policy on coronavirus during the interview, Trump replied, Look, I take responsibility always for everything because its ultimately my job too. I have to get everybody in line. Some governors have done well, some governors have done poorly. We have more testing by fair than any country in the world.

As of Tuesday, COVID-19 had infected 14.7 million people globally. It had killed more than 610,149 people worldwide, according to Johns Hopkins Universitys Center for Systems Science and Engineering. New York, once the epicenter of the virus in the U.S., has still had the most deaths of any state (32,506), followed by New Jersey (15,715) and Massachusetts (8,433).

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On Feb 29, the surgeon general tweeted his opposition to the public wearing masks. Seriously people: STOP BUYING MASKS! he wrote. They are NOT effective in preventing general public from catching #coronavirus, but if health-care providers cant get them to care for sick patients, it puts them and our communities at risk! He reversed course in April.

The public was, understandably, confused. N95 masks appear to be effective for health-care workers. One study says N95 medical-grade masks do help filter viruses that are larger than 0.1 micrometers. (One micrometer, um, is one millionth of a meter.) The coronavirus is 0.125 um. The masks have efficacy at filtering smaller particles and are designed to fit tightly to the face, the study said.

The markets appear torn between optimism on vaccine research and the economic impact of new infection surges, particularly in California, Arizona, Florida and Texas. The Dow Jones Industrial Index DJIA, +0.70% closed higher Monday as investors looked toward the prospect of further fiscal stimulus. The S&P 500 SPX, +0.27% and Nasdaq Composite COMP, -0.60% also ended higher.

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Trump tweets photo of himself wearing a mask in apparent U-turn: Many people say that it is Patriotic to wear a face mask - MarketWatch