Trump's tweet raises obstruction of justice questions

Why it matters: Until now, it was understood that the White House only recently learned about Flynn lying to the FBI, which he admitted yesterday in court. But Trump and White House administration officials will likely have to answer for this tweet because it introduces a new piece to the Russia puzzle that Bob Mueller could specifically use to get more information about how much Trump knew.

Be smart: Trump confidants are worried about an obstruction of justice case being built against Trump, according to Mike Allen's reporting this morning. But a tweet isn't going to get Trump in legal trouble, and any legal action against him or anyone in his inner circle would take weeks of probing by Mueller and his team.