There is no Republican party, just a Trump party, and this may be the death knell of that party.
Half of Republicans don't think masks are required, imagine a few months of churchs, etc. open in Red States with a sizeable minority refusing to wear masks because it "infringes on their liberty," somewhere around July the death toll will become horrendous and the 65+ voters will desert in droves.
The only reliable (and it still suffers from sampling bias) is from NYC right now, though randomized tests are starting to be conducted elsewhere, in areas of low infection false positives are a real issue for antibody tests. NYC data suggests a 10:1 infected to confirmed ratio, which will decline as testing increases (% positives for tests have declined from 20% to 10% as tests spread outside those with severe symptoms).
Herd immunity is mass murder, right now probably 5% of Americans have been infected and we're nearing 100K dead. To get to 60-70% we're talking a million plus, and we went batshit over the Twin Towers killing 3K.
Basically, the right policy right now is to carefully reopen, MANDATORY masks in any enclosed area with severe fines, ramp up testing - tracing - isolation. The goal should be to keep the rate of infection low until a drug treatment is developed to reduce mortality, and eventually (12-18 months if we're lucky) a vaccine which must be developed, produced and distributed to 300M people.
However, the Great Orangutan (GO) is promoting reckless and stupid behavior, instead of providing leadership in times of crisis, he has the Oligarch playbook, "while I shelter behind a barricade of tests workers should go back to work without sufficient protection to restart the economy for my November election."