House Ethics Committee investigating embattled N.Y. congressman
U.S. Rep. Robert Garcia (D-Calif.) among measure's sponsors
26-year-old congressman has been a gun violence prevention advocate since 2012
Measure passed by 213-208 vote margin
Measure would extend federal anti-discrimination protections to LGBTQ Americans
Openly gay N.Y. congressman appeared on 'GMA3'
'Everyone should be speaking out' against anti-trans extremism
Measure scheduled for markup in House committee on Wednesday
Gay Republican Congressman George Santos co-sponsored bill
10-member body voted unanimously to bring investigation
