Sen. Ron Johnson (R-Wis.), the chairman of the Homeland Security panel, one of the two Senate committees conducting an investigation, wants to find out who in the Obama administration leaked to the media the gist of Flynn’s phone conversations with Kislyak — a revelation that embarrassed the nascent Trump administration and led to Flynn’s swift ouster.

“I certainly have suspected for quite some time that there was a concerted effort to sabotage this administration from the day after the election,” Johnson said. “There are a lot of questions that deserve answers.”

Republican lawmakers believe finding out who leaked would enable Trump and his allies to argue that Obama administration officials were listening in on Flynn’s calls not only out of concern for national security but also to collect political ammo.