That's not true. People voted them out in 2016 but their votes were not counted, or their registrations were falsely and illegally cancelled, etc. There is a lot more at play here than people's choices; and given that people's ability to choose with correct information and free will has been significantly hampered by Republican-led efforts to reduce the quantity of real factual information in the hands of voters, replaced with lies designed to steal votes.
Now I know that Donald Trump lies a lot, like a lot but sometimes he tells the truth. He has stated at least 5 times that neither he nor his supporters would accept any election results where he did not win.
The current President threatens the nation regularly with his active plans to cancel the next elections and stay in power.
Be careful assuming that the popularity of politicians or their party has anything at all to do with them being in power. It doesn't.