Rep. Devin Nunes is the chairman of the House Intelligence Committee, which has the power to investigate claims of Russian attempts to influence the election, in addition to claims of Russian contacts with the Trump campaign.

He said the only "major crimes" he'd seen had been committed by leakers: "We can't run a government like this. A government can't function with massive leaks at the highest level."

Nunes says he hasn't seen "any evidence of anyone from the Trump campaign or any other campaign, for that matter, that's communicated with the Russian government."

He added: