the campaign.

Specific topics upon which Republican and Democrat investigators on the Senate Intelligence Committee agree include investigative findings on the security of U.S. election systems, the political impact of social media, and examinations of how U.S. spy and law enforcement agencies responded to suspected Russian activities both before and after the election.

The committee also is working on final assessments of whether there was collusion between Republican Trump and his campaign and Russians. But on this issue Republicans' and Democrats' assessments diverge, with the political rivals agreeing there is a lack of direct evidence of collusion, but Democrats saying there is ample circumstantial evidence to support such a finding.

The U.S. House of Representatives Intelligence Committee on the other hand is bitterly divided. Republican members of the panel opened asession on Thursday on Russian meddling with an attack on Democratic chairman Adam Schiff. They said all nine Republican members had signed a letter asking him to resign because of his criticism of the president's 2016 campaign and Russia.

(Reporting By Mark Hosenball; additional reporting by David Morgan; editing by Grant McCool)