Former CIA director warned Russia against election meddling on Aug. 4

UPDATE: Former CIA director says he warned Russia against meddling in the 2016 election in Aug. 4 call to Russia intel chief.

Former CIA Director John Brennan is testifying publicly about the intelligence underpinning the Obama administration's conclusion that Russia interfered in the 2016 election and could shed light on concerns about the security risk posed by President Donald Trump's first national security adviser, Michael Flynn.