WASHINGTON (AP) — Former New Jersey Gov. Chris Christie said Thursday that he was wrong not to wear a mask at the White House, after he and President Donald Trump both came down with the coronavirus.

Christie, in a statement, said he has recovered from COVID-19 after a weeklong stay in a hospital’s intensive care unit. He called on all political leaders to advocate for face coverings, with the practice becoming increasingly politicized even as the pandemic has killed more than 217,000 Americans.

“I believed that when I entered the White House grounds, that I had entered a safe zone, due to the testing that and I and many others underwent every day,” Christie said. “I was wrong.”

Christie, who was at the White House for the announcement of Judge Amy Coney Barrett as the president’s nominee to the Supreme Court and to participate in several rounds of Trump’s debate prep, seemingly chided the president’s attitude toward the disease.

“No one should be happy to get the virus and no one should be cavalier about being infected or infecting others,” Christie said.

At a town hall in Miami on Tuesday night, President Donald Trump said of Christie’s statement, “He has to say that.” The president insisted he supports masks and called Christie “a friend of mine.”

Christie said, “Every public official, regardless of party or position, should advocate for every American to wear a mask in public, appropriately socially distance and to wash your hands frequently every day.”