Pretend-sident 

A pretender; to pretend about an incident, resident, etc. A trespasser or liar.

He doesn't live here, he's a pretend-sident.

Pretend-sident by Smartycat May 16, 2017

pretendsident 

Someone pretending to be president.
fake

The former president was amazing. The person holding that position currently didn’t even get half the popular vote; he’s a pretendsident.

pretendsident by SpanielMom September 10, 2018