Shouldn't the House have Mueller testify AFTER he leaves the DOJ?

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4. Mueller was making a fortune as partner of a top law firm, which he could go back to instantly.

He's not at the DOJ, nor does have have to stay at the DOJ, for financial reasons.

Also, whether or not Barr asks him to do new tasks, he can quit anytime he wants. It's not like he was drafted into the army. He can work where he wants.....when he wants.

Last, when he is a private citizen again, he can show up at any hearing he wants to show up to and will be free to speak his mind. How are they going to stop him? Are they going to physically stop him if he testifies after being told not to do so by the Trump administration? He is more than knowledgeable enough to know that any instruction from the DOJ or the Trump administration not to testify would be an illegal request unsupported by law. I think he will testify even if they tell him not to. If so, I don't see what power they would have over him, nor an actual mechanism they could use to stop him.