It's uncertain the specific misconduct Trump officials believe could justify criminal charges, which would require grand jury approval.

Russia said on Tuesday that it would no longer place any limits on where it deploys intermediate-range missiles that can carry nuclear warheads. Kremlin spokesman Dmitry Peskov was speaking a day after Russia said it was lifting what it called a unilateral moratorium on deploying intermediate-range missiles,

Russia has announced it is ending its self-imposed moratorium on the development of short- and medium-range nuclear missiles, deepening a nuclear weapons stalemate between Moscow and Washington.