Republican Senator Ron Johnson is asking the Government Services Administration why it didn't "protect" Trump transition emails. "GSA's alleged actions could have serious ramifications for presidential transitions in the future," he wrote to the head of the GSA.

Why it matters: Axios' Mike Allen has reported that Mueller obtained "many tens of thousands" of Trump transition emails from the GSA, which hosted the transition email system. Trump's lawyers have called collection of the emails by Mueller "unlawful."

Among the things Johnson requested from Murphy: