Rep. Ruppersberger: "I wouldn't be surprised if a Russian was involved" with downing MH17

A senior Ukrainian official tells CNN a Russian officer triggered the missile that struck Malaysia Airlines Flight 17, killing all 298 people on board.

U.S. intelligence officials say they can't confirm exactly who fired that missile and whether the Russian military was responsible. But Ukraine claims they have the evidence to prove it.

Outfront, the top Democrat on the Intelligence Committee: Congressman Charles Albert"Dutch" Ruppersberger. He's been briefed on the MH17 crash.