Protest took place outside agency's D.C. headquarters on Wednesday
Letter notes Roxsana Hernández case
Texas Democrat represents border city of El Paso
Disease could be 'death threat' to anyone with compromised immune system
Letter notes trans woman died while in agency's custody
Bill would require country to promote LGBTQ rights abroad
El Paso activists struggle to support Mexican counterparts
Johana 'Joa' Medina Leon passed away in Texas hospital on Saturday
