The 25th Amendment of the US Constitution provides for replacing the President should he be unable tp discharge his duties. The Democrats are suggesting replacing Trump under this provision , Article 2 , Section 1, clause 6 (216 is 6x6x6). This information , below at the bottom, is copied from Wikipedia .....

 Rev.17 v.10 where the 7th King (who certainly seems to be Trump) is described as "will continue a short space". Perhaps the word "continue" is an indication that Trump will "continue" from a prior election, his second election,  but then just for a "short space" , being removed by section 6x6x6 ? If so, we are getting close to dramatic changes.

WIKIPEDIA

Article II, Section 1, Clause 6 of the Constitution reads:

This provision is ambiguous as to whether, in the enumerated circumstances, the vice president becomes the president, or merely assumes the "powers and duties" of the presidency. It also fails to define what constitutes inability, or how questions concerning inability are to be resolved.[3] The Twenty-fifth Amendment addresses these deficiencies.