Flynn could prove to be key asset in Mueller's U.S. campaign probe, sources say

WASHINGTON/NEW YORK (Reuters) - Lawyers for former national security adviser Michael Flynn have halted communications with U.S. President Donald Trump's legal team, a potentially critical step in the probe into contacts between Trump's election campaign and Russia, sources familiar with the investigation said on Friday. Flynn's lawyer, Robert Kelner, called John Dowd, Trump's private lawyer, on Wednesday to say the matter had reached a point where the two could no longer could discuss it, two people familiar with the call told Reuters on Friday.