Washington( CNN) Republicans and Democrats are demanding more information about connections between President Donald Trump's former national security adviser Michael Flynn and several foreign entities — including the Kremlin-backed media outlet RT.

The top Democrat and Republican on the House Oversight Committee sent individual letters to four top Trump administration officials requesting any documents they have related to Flynn's communications with and payments from Russian, Turkish or other foreign sources.

“We are asking the Department of Defense and FBI and others to devote us anything he has had to do with the Russian government and with Russians and others because he lied to us over and over again, ” Rep. Elijah Cummings of Maryland told CNN's “New Day” Thursday.