Ky. Republican has been in chamber since 1985
Challenges come despite bipartisan interest in addressing the problem
The former president has led an anti-trans campaign
Nonbinary Okla. teenager died earlier this month
Pundit defended his infamous anti-trans remarks at last year's event
Senator's bill introduced Feb. 1
Ga. Republican has long history of attacking health official
Close allies of the former president propose an extreme right-wing agenda
26 Democratic members signed the letter
The bill is now backed by more than 60 senators