Meet the 3 men who pull the strings of the U.S. government's investigation of Trump's ties to Russia

Among the sources used:
Sessions: "Something Big is Happening... People Are Taking Their Country Back".  (Townhall, 8/25/2016)
California Rep. Devin Nunes named to Trump's transition team.  (Los Angeles Times, 11/11/2016)
Trump administration sought to enlist intelligence officials, key lawmakers to counter Russia stories.  (Washington Post, 2/24/2017)
GOP Intel chair Burr under fire over ties to Trump.  (Politico, 2/27/2017)
House Intelligence Chair Devin Nunes warns against 'witch hunt' over Trump-Russia ties.  (Los Angeles Times, 2/27/2017)
The ultimate guide to Donald Trump's Russia connections.  (Quartz, 3/4/2017)