What's still on Mueller's to-do list?

The charging documents pointedly stopped short of saying that the Russian efforts tipped the election to Trump, or that Trump campaign officials knowingly coordinated with the Russian agents. Legal experts, however, say that it’s entirely possible that the indictments of the Russians are just the foundation for future charges against Americans who may have solicited or participated in the circulation of the hacked materials or offered favorable treatment on issues like sanctions in exchange.1

The question is whether these Americans — if they exist and are charged — were affiliated with the Trump campaign and how close they are to the president. One frequently discussed possibility is that Roger Stone, an informal Trump advisor who has been under scrutiny for some time because of his murky links to people responsible for hacking and leaking the Democrats’ emails, will be indicted.

Stone, who formally cut ties with Trump in 2015, was a relatively minor figure in the president’s campaign. But the indictment of anyone affiliated with the president for crimes related to election interference could mark a turning point in the investigation, which so far hasn’t addressed the question of whether Americans knowingly worked with Russians to influence the outcome of the election. And it’s still possible that higher-level members of the Trump campaign — even the president or his children — could eventually be implicated.