Clinton was impeached for lying about a blowjob. Now Trump is lying about his campaign’s collusion with foreign power enemy of this nation to interfere with our Presidential election in his favor. He’s not just lying, he is committing felonies to cover it up by firing investigators and intimidating a key witness.
What happened with the firing of Comey would be as if Clinton fired Kenneth Starr and then made public statement aimed at intimidating Starr from commenting on the issues he investigated. Had Clinton gone that far I suspect the vote in the Senate would have gone against him.