Getting rid of Comey removes the guy who is running the Russia investigation. It removes the guy who can look Congress in the eye and say credibly that the FBI is investigating whether anyone in the Trump orbit was actively working with the Russians. It removes the guy who, in February, reportedly refused the White House’s request to publicly knock down stories about Trump and Russia while congressmen in key positions of investigatory responsibility allegedly complied. It removes the one person of stature (figurative as well as literal) in the government whom everyone knows will—even when he’s wrong—do what he thinks is the right thing and damn the torpedos. It removes, in other words, the essential person for a credible investigation.

It’s a neat trick: stymie the Russia investigation by siding with Hillary Clinton. Put another way, what if you had a Saturday Night Massacre and liberals cheered because they hated Archibald Cox?

The question before us now is whether Trump will get away with it. There is no question that the President has the legal authority to remove the FBI director. But there’s also no question that removing the FBI Director in the midst of a high-stakes investigation of Russian influence in the inner circle of the President’s campaign and White House is a horrifying breach of every expectation we have of the relationship between the White House and federal law enforcement.

What’s more, there is also no question that members of Congress, particularly members of the Senate, who are concerned about the integrity of that investigation and, more broadly, about preventing the gross political intervention in ongoing law enforcement and intelligence operations have tools at their disposal. We expect them to use those tools, as every American should.