Fox News: "Mueller reportedly impanels grand jury in Russia probe."
Hot Air thinks that since Mueller has crossed the "red line" into investigating finances, Trump might fire him. And then there's another rumor, probably true, that Mueller want to know more about Trump "I love it!" Jr's meeting with the Russian lawyer.
I don't know. Since it's obvious that nothing stays secret in Washington, it seems unlikely to me that the hottest, juiciest, most Presidency-ending gossip would not have leaked out by now.