“Have you no sense of decency?” It’s the question that the members of the Republican majority in the Congress—51 senators, 239 representatives—might bear in mind, in the “shithole” era.

If only two of those senators would stand up against Donald Trump, with their votes rather than just their tweets or concerned statements, they would constitute an effective majority.

With the 49 Democratic and independent senators, these two would make 51 votes, which in turn would be enough to authorize real investigations. They could pass a formal resolution of censure. They could call for tax returns and financial disclosure. They could begin hearings, on the model of the nationally televised Watergate hearings of 45 years ago.

They could behave as if they took seriously their duties to hold the executive branch accountable. They could make a choice they know will be to their credit when this era enters history — as did the Republicans who finally turned against their own party’s President Nixon during the Watergate drama, as did the Democrats who finally turned against their own party’s President Johnson over the Vietnam war, as did the Republicans who finally turned against their own poisonous Senator McCarthy in the episode that gave rise to “Have you no sense of decency?” more than 60 years ago. They could spare themselves the shame that history attaches to people who did the wrong thing, or nothing, or kept looking the other way during those decisive periods.