I like the term “disqualify”.
If the legal definition is the same as in sports, it means #2 wins.
And Trump is president.
I recommend that you read the United States Constitution. The only way for Trump to become President again is by winning the election in 2024. Depending on State Election Laws, the election for other offices can be decertified and then the office can be declared vacant, requiring a special election or appointment of a person to fill the vacancy.
Biden can be removed only via impeachment. If he were to be convicted by the Senate, then the Deputy Fuhrer, Kamala Harris would become the President.