Houthis vow 'strong and effective response' to U.S. strike, this after the U.S. conducted another, unilateral strike in Yemen last night, according to two U.S. defense officials. The strike targeted a Houthi radar site. The Houthis, who control much of Yemen, have vowed retaliation, raising concerns of a broader regional conflict. Biden said the U.S. will respond if the Houthis "continue this outrageous behavior." Subscribe to LiveNOW from FOX! https://www.youtube.com/livenowfox?sub_confirmation=1 Where to watch LiveNOW from FOX: https://www.livenowfox.com/ Follow us @LiveNOWFOX on Twitter: https://twitter.com/livenowfox Raw and unfiltered. Watch a non-stop stream of breaking news, live events and stories across the nation. Limited commentary. No opinion. Experience LiveNOW from FOX.