The president's ban against transgender people serving in the military has apparently cost a transgender student at the University of Texas his scholarship.
"This discriminatory policy will lead Transgender service members, patriots who have decided to serve their nation, to live in the shadows," McCain said.
The Supreme Court's decision "enables the administration to further disrupt our military and weaken our national security," the Democratic senator said.
The organizers are rallying against policies including the transgender military ban.
"Every single federal court to look at President Trump's policy has already found that it reeks of undisguised and unlawful discrimination against qualified transgender people willing and able to serve our country."
Two courts have blocked Trump's transgender military ban. What's next?
"Star Trek" legend George Takei says Trump "just pissed off the wrong community."