Congressional investigators are running into new challenges with their Russia probes, facing a mountain of records to sift through, uncertainty about the leads they are chasing and partisan disagreement over whether there was any collusion between the Kremlin and Trump advisers.
CNN: Hill investigations on Russia run into hurdles
U.S. President Donald Trump addresses a joint session of the U.S. Congress on Feb. 28, 2017 in the House chamber of the U.S. Capitol in Washington, DC.
