He found out Bill cucked him

I yawned

Maybe he could not shake hands because the Secret Service medical staff who is charged with protecting the President; warned him that Clinton has something contagious. The life of our President is more important than a photo opportunity for some offended loser.

Trump is a petty man

He also didn't shake President Carter's hand

Ill mannered SOB ,Trump is

At least you didn't ask me how I felt about it, so that's measurable progress, right?

I think the fact that the Clintons pretended not to see him had something to do with it.