There have been lots of questions, especially among liberals, about when congressional Republicans might turn on President Trump, particularly in the wake of his controversial firing of FBI Director James Comey and the reports late Monday that he compromised classified information. The assumption behind these questions is that at a certain point, something so outrageous will be revealed about Trump that the resulting scandal will … er … trump party loyalty.

But, at least historically speaking, even the biggest scandals don’t wash away partisanship.

We went back and looked at key congressional votes during three relatively recent periods in which a president was accused of wrongdoing: Watergate (Richard Nixon), Iran-contra (Ronald Reagan) and the Monica Lewinsky scandal (Bill Clinton). Two trends stick out. First, partisanship still matters. And in a big way. Second, when defections do come, they’re more likely to come from the centrist wing of a party.