What drugs have proven to be effective against the coronavirus?
Excellent point. Every drug being used to fight COVID-19 infections is being used without the benefit of a double blind test of its effectiveness. Every single one.
Senator Schumer and his anti-Trump cabal harp on Hydroxychloroquine because President Trump mentioned the early medical trials from around the world that indicated it effectiveness.
Meanwhile, elite liberals in Schumer's circles are getting vitamin and supplement concoctions dripped into their veins, using quack "Pulsed Energy" machines, and taking baths in Clorox to remove "radiation" from their bodies supposedly caused by their wi-fi networks. Oh, and a bit of natural Chloroquine from tree bark since that isn't an "unproven" treatment.
Your question should be asked of every Democrat who criticizes the use of Hydroxychlorquine.