Thom Tillis explains decision to vote against Democrat resolution

Two-and-a-half weeks ago, North Carolina Sen. Thom Tillis published an op-ed in The Washington Post vowing to vote in favor of a Democrat-drafted resolution to nullify President Donald Trump's national emergency. In a stunning last-minute reversal Thursday, he reneged on that vow.

Why the abrupt about-face? In a four-minute speech on the Senate floor, the North Carolina senator explained why he'd initially written the op-ed and what had changed since.