What did the RATs have on him?
Gallagher always looked a bit effeminate and pretty boy. I'm certain that he has a "secret closet".
Entirely possible they do - you never know what all can be involved.
It is also entirely possible this is being done out of pure pettiness - he voted against impeaching Mayorkas and took a lot of flack for it. He was disgusted by the pushback and decided he would literally take his marbles and go home - and stick it to the people who criticized him by resigning later, refusing to consider it would affect more than those for him he was sticking it to - namely the country at large. Can mere human pettiness cause someone this significant? You better believe it. The fact he lined up a lucrative job vs. just quietly fading away into the background would seem to indicate it could be nothing more than this...and “spending time with family” doesn’t seem to be it, either, given he’s going to be doing a job that is quite a busy one.