At this point the more or less official G.O.P. line is that the budget office — whose director, by the way, was picked by the Republicans themselves — can’t be trusted. (This attack provoked an open letter of protest signed by every former C.B.O. director, Republicans and Democrats alike.) In particular, the claim is that its prediction of huge losses in coverage is outlandish, and that to the extent that fewer people would be covered, it would be due to their voluntary choices.

In reality, those C.B.O. predictions of coverage losses are totally reasonable, given the Senate bill’s drastic cuts to Medicaid — 26 percent by 2026, and even deeper in the next decade. You have to wonder how someone like Senator Shelley Moore Capito of West Virginia could even consider supporting this bill, when 34 percent of her nonelderly constituents are on Medicaid. The same goes for Jeff Flake of Arizona, where the corresponding number is 29 percent.

And on those claims that it’s O.K. if people drop coverage, because that would be their own choice: It’s crucial to realize that the Senate bill would degrade the quality of subsidized private insurance, leading to a huge rise in deductibles.

Current law provides enough in subsidies that an individual with an income of $26,500 can afford a plan covering 87 percent of medical expenses, which, the C.B.O. estimates, implies an $800 deductible. The Senate bill reduces that standard of coverage to 58 percent, which would raise the implied deductible to $13,000, making the insurance effectively useless. Would deciding not to buy that useless insurance really be a “choice”?

By the way, remember when Republicans like Paul Ryan used to denounce Obamacare because the insurance policies it offered had high deductibles? It’s hypocrisy all the way down.

In short, the Senate bill is every bit as cruel and grotesque as its critics say. But we need to keep reminding wavering senators and their constituents of that fact, lest they be snowed by a blizzard of lies.

I’m not saying that everyone should ignore Trump-Putin-treason and all its ramifications: Clearly, the fate of our democracy is on the line. But we mustn’t let this mother of all scandals take up all our mental bandwidth: Health care for millions is also on the line.

And while ordinary citizens can’t yet do much about the looming constitutional crisis, their calls, letters, and protests can still make all the difference on health care. Don’t let the bad guys in the Senate do terrible things because you weren’t paying attention!