A former campaign official recalled, “If you’re the perpetrator of a cough or of a sneeze or any kind of thing that makes you look sick, you get that look. “You get the scowl.” When acting Chief of Staff Mick Mulvaney started coughing during an interview, Trump said, “I don’t like that, you know. I don’t like that. If you’re going to cough, please, leave the room.”

Across multiple interviews with Howard Stern, he said he likes to wash his hands “as many times as possible,”

Trump has also said he likes fast food for it’s “cleanliness,” always uses a straw for his drink to avoid “contamination,” prefers steak well-done with ketchup, and uses utensils to eat fried chicken.

Politico – The Purell presidency: Trump aides learn the president’s real red line
Newsweek – Trump says he is scared of germs and needs to drink from a straw to avoid contamination
The Independent – Donald Trump admits ‘I have germ phobia’ in Howard Stern interview
CNN – Donald Trump really likes fast food