NSC Official Who Raised Concerns About Trump's July Phone Call With Ukraine's President Testifies

Army Lt. Col. Alexander Vindman is testifying Tuesday as part of the impeachment inquiry into President Trump. He's a Ukraine expert on the National Security Council and the first official to testify who was listening in on the president's July phone call with the Ukrainian president.

Here & Now's Tonya Mosley gets the latest on the impeachment inquiry from Greg Jaffe (@GregJaffe), national security reporter for The Washington Post.