Trump lies about something that can be googled
 

why does he keep doing this ?

Trump falsely said he never tweeted “check out a sex tape” in the wee hours of the morning a few days after the first presidential debate. He did.

Wow! Let's impeach him!

He really annihilated Hillary last night, didn't he? :boom:

Because he's a pathological liar. He doesn't even know he's doing it.

When you are an employee whatever your boss says is what you better believe when the boss is around. It's the customer is always right attitude that store workers practice to survive at the workplace. Trump is not used to being a public servant. It's been a long time since he had to listen to anyone.