The U.S. Senate Intelligence Committee is pursuing a wide-ranging investigation into former White House adviser Steve Bannon's activities during the 2016 presidential campaign, three sources familiar with the inquiry told Reuters.

The committee is looking into what Bannon might know about any contacts during the campaign between Moscow and two advisers to the campaign, George Papadopoulos and Carter Page, they said.

Papadopoulos, a consultant, initially advised the presidential campaign of Republican hopeful Ben Carson before joining the Trump campaign. Page is also a consultant, who had business contacts in Russia.