President Donald Trump went to a New Jersey fundraiser for his reelection campaign on Thursday, mingling with crowds and posing for photographs mere hours before he tweeted that he’d tested positive for the coronavirus.

Trump appeared at his Bedminster golf club despite learning that one of his closest aides and advisers, Hope Hicks, had tested positive for COVID-19 earlier in the day.

Hicks has been in close quarters with Trump and many other senior-level White House officials, having traveled with them Tuesday for the first presidential debate.

New Jersey’s governor, Phil Murphy, tweeted on Friday morning that anyone who had attended the fundraiser should go get tested for the virus. He also wished Trump and first lady Melania Trump a “speedy” recovery.