Yeah apparently he is obsessive compulsive about it....did it a bunch while he was president.
Might have a bit of germaphobia. People say that he uses hand sanitizer a lot.
My biology professor was like that. He said he takes a cooler with him when he goes grocery shopping in order to keep the milk, meat, and dairy products cold until he gets home. That way the food doesnt have a chance to get warm enough for bacteria to grow.
Some people are weird when it comes to that stuff.