Rubio, a member of the intelligence panel who literally just had dinner with Trump Monday night at the White House, attempted to find cracks in Comey's testimony, and went out of his way to point out that the president didn't specifically order Comey to shut down the Russian investigation, he merely asked. Rubio also pointed out that the whole "cloud" thing was just Trump wanting Comey to tell the public he wasn't under investigation.
You can watch the whole segment above.
Then, like a barnacle stuck to the side of one of Trump's yachts, Rubio asked Comey, "You ever wonder why of all the things in this investigation, the only thing that has never been leaked is the fact that the president is not personally under investigation?"
Besides the fact that it's no secret, and that whether or not the president is personally under investigation has been reported on over and over again, Comey didn't take the bait, shrugging off the non-question with, "I don't know, I find matters that are briefed to the gang of eight are pretty tightly held."
Trump may even give Rubio a whole sundae after this.