The US Congress appears to be the target of a foreign disinformation campaign aimed at influencing lawmakers' activities and the upcoming presidential contest, top Democrats said in a letter released on Monday.

In the letter to FBI Director Christopher Wray, dated July 13, House Speaker Nancy Pelosi, Senate Democratic leader Chuck Schumer and the top Democrats on the House and Senate intelligence committees said they were "gravely concerned" that Congress seemed to be in the crosshairs of "a concerted foreign interference campaign, which seeks to launder and amplify disinformation in order to influence congressional activity, public debate and the presidential election in November"...