(Want to get this briefing by email? Here’s the sign-up.)

Good morning.

Here’s what you need to know:

Flynn splits from Trump.

• Lawyers for Michael Flynn and President Trump are no longer talking, four people involved in the case told us.

It’s a sign that the former national security adviser is either cooperating with prosecutors who are investigating the Trump campaign’s ties to Russia, or negotiating a deal with them.

Both Mr. Flynn, an early adviser to the president, and his son, Michael Flynn Jr., are seen as having significant criminal exposure. The White House has said that neither Mr. Flynn nor other former aides have incriminating information to provide about Mr. Trump.