ad hominem - attacking the character or motive of the person making an argument, rather than attacking the argument itself.
: Miller attacks Bannon's character and motives for alleging Trump met with those in the Trump Tower meeting, without refuting that Trump met with those in the Trump Tower meeting.

ad hominem - attacking the character or motive of the person making an argument, rather than attacking the argument itself.
: Miller attacks the whistleblower's character and motives for coming forward, without refuting the whistleblower's allegations.