Them first.
If you don’t respond you are a punching bag that doesn’t hit back.
The average Trump supporter will be disappointed because Trump is not Trump, and if he doesn’t hit back hitlery will relentlessly attack even more and the media will assault Trump and re-play constantly the attacks/insults/etc against him.
“The Trump campaign has no comment” is not a strong close.
Inaction or silence is not a response, and trying to be the “adult” in this fight means you are fighting by Marcus of Queensbury rules while hitlery street fights.
GWB spent 8 years turning the other cheek, never responding to all of the leftist lies.. they just became more emboldened, people bought their scurrilous lies, and the Republican (and to some extent, by connection, the conservative brand) was severely tarnished