The Chief Justice's Testimony in the Dobbs Case

The Senate has asked the Chief Justice to come in and testify. Can they force Thomas to testify at a Judiciary Committee hearing, or do they have no power over him? Well, they could request and he can decide whether he will or not. If he doesn't, they could subpoena him. He might even be willing to litigate that question because of separation of powers kinds of questions. At best, it would likely take some time for that to happen if the Senate were to make that request and he were to deny it.