Karine Jean-Pierre made comments during Thursday's briefing
House Ethics Committee investigating embattled N.Y. congressman
Friday was International Transgender Day of Visibility
Former commander-in-chief is first former president indicted
Statement comes against backdrop of anti-transgender laws
U.S. Rep. Robert Garcia (D-Calif.) among measure's sponsors
Rep. Frost calls on Biden to speak out against wave of legislative attacks
Ugandan lawmakers passed anti-homosexuality bill last week
26-year-old congressman has been a gun violence prevention advocate since 2012
Measure passed by 213-208 vote margin