Congress can’t requalify him for office. They and only they have the authority but they don’t have the votes.
I don’t disagree with the rest, but this part I just have no idea what part of the constitution you are referencing. He’s 35+, a natural born citizen, and a 10+ year resident. That’s it. He’s qualified because beyond that the founding fathers foolishly had faith that the citizenry would hold politicians to account. I guess to their credit that worked for a couple hundred years.