Does Donald Trump say "Believe Me" more often than other politicians ?

It certainly seems that way to me...

Probably because what he is saying is so far from the truth tht he wants people who are listening in the first place not to think, but rather just to trust him rather than themselves....

And since in his own world previously he always had the final decision, I would suspect "Believe me" was the way he indicated that a meeting with his subordinates (anybody but him or Fox news, I guess) was over.

His conversations are always lavishly sprinkled with outrageous proclamations.  I don't believe him because he has no concept of reality.  Every utterance is meant to show he's the best, knows the most, is the most intelligent, etc.  He's going to need rotator cuff surgery if he keeps patting himself on the back. 

-Believe me
-Trust me
-I know more than anyone else
-I won the election you know.
-Look at the crowds that worship me.
- Don't believe the media, all Fake news
-I'll tell you what you need to know
and what you should think.

...Yeah man
He's the most_________ _______there is.

I think it's because he's not even certain of his own existence so he wants to shift the burden of proof on us, he wants us to prove to him he actually exists.

I haven't actually counted, but I would guess that he does.

To be completely honest, that's not a phrase I believe I've ever heard before from a politician.  They avoid it because it's usage signals that you are covering something.