The administration's rule says federal law that bars discrimination in healthcare "on the basis of sex" does not cover gender identity or sex stereotyping.
SalivaDirect is seen as a cheap, simpler and less invasive testing method that requires no extraction of nucleic acid and can use several readily available reagents.
The 17-person keynote spreads the spotlight typically used to highlight one person as millions are expected to tune in to the scheduled formal nomination of former Vice President Joe Biden.
"The President, his cronies and Republicans in Congress continue to wage their all-out assault on the Postal Service and its role in ensuring the integrity of the 2020 election."
Trump campaign spokesman Tim Murtaugh said the ad purchases could total more than $10 million and the expenditure will be at least in the high-seven figures.
After hours of shouting, and the burning of a Confederate flag, the protest devolved into scuffles and fist fights, drawing in police backed by a SWAT team.