Howie Mandel Says Trump's Germaphobe Excuse Isn't Legit

Howie Mandel -- maybe the most famous germaphobe -- is calling BS on Donald Trump's claim he's one too ... because it just doesn't make sense in this particular alleged situation.

Howie explained why fearing germs is not a good alibi for the alleged sexual act detailed in the totally unconfirmed Russian dossier. Even if it were legit ... the Prez-elect's excuse just doesn't add up.

Still, he thinks Trump's press conference is doing great things for the germophobic community. Howie might even have a new slogan for him.