The allegation made by Christine Blasey Ford — that at age 15 she was the victim of a sexual assault by a 17-year-old Brett Kavanaugh — has not only upended Judge Kavanaugh’s Supreme Court confirmation hearings, but has also left Americans wondering what standards should apply to an accusation like this.

It’s natural to place this sort of accusation within a criminal-justice framework: the burden of proof beyond a reasonable doubt; the presumption of innocence; the right to confront and respond to an accuser. If Judge Kavanaugh stood criminally accused of attempted rape, all of that would apply with full force. But those concepts are a poor fit for Supreme Court confirmation hearings, where there’s no presumption of confirmation, and there’s certainly no burden that facts be established beyond a reasonable doubt.

What matters here isn’t law as much as politics — though not (or not just) partisan politics. Confirmation hearings are also about constitutional politics — the debate, involving both institutions of government and the polity, about what the Constitution means and requires.

So what standard should the Senate use in evaluating the claims made by Dr. Blasey and in deciding how they bear on Judge Kavanaugh’s fitness for a seat on the Supreme Court? The Senate’s approach to its constitutional “advice and consent” obligation has always depended on context. A number of factors matter: the timing of the vacancy; the justice being replaced; the nominee’s likely impact on the ideological makeup of the court; even the popularity of the president (very popular presidents have always had more leeway when it comes to picking justices). Then, of course, there’s the nominee.