Adam Schiff's said in his opening statement at the Senate impeachment trial that we need to impeach Trump because if he wins then that means he cheated.

He said:

As we will discuss, impeachment exists for cases in which the conduct of the President rises far beyond mere policy disputes to be decided, otherwise and without urgency, at the ballot box.

Instead, we are here today to consider a much more grave matter, and that is an attempt to use the powers of the presidency to cheat in an election. For precisely this reason, the President’s misconduct cannot be decided at the ballot box—for we cannot be assured that the vote will be fairly won. In corruptly using his office to gain a political advantage, in abusing the powers of that office in such a way as to jeopardize our national security and the integrity of our elections, in obstructing the investigation into his own wrongdoing, the President has shown that he believes that he is above the law and scornful of constraint.

Remember in 2016 when Hillary and the media made this their big talking point. Funny we don’t hear that now.