Revealed: House Dems plan to take Trump to court in 2019

Democrats have committed to investigating the Trump administration when they take control of the House in 2019. Ari Melber breaks down how the Trump administration could ultimately refuse to cooperate and in that scenario there will likely be a key legal fight, because Democratic chairs cannot act alone to enforce a subpoena. Melber examines a case in history where Democrats were able to bring legal pressure to the Bush White House, under then-Speaker Nancy Pelosi.