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coverage of the iowa caucus will continue. see you sunday morning. happening now, u.s.-led air strikes inseed yemen trigger a vow of retaliation by iran-backed militants. mass protests erupt in yemen and fears of a full scale regional war intensify. also this hour, a potential blizzard and bitter cold are disrupting the final push to the iowa caucuses. we're tracking the candidates and severe weather with only three days to go before the first presidential votes of 2024. welcome to our viewers here in the united states and around the world. i'm wolf blitzer, you're in the situation...

We designated the houthis as a foreign terrorist organization. they're doing it on behalf of the iranian government. this is a very aggressive move from iran's proxies just like hezbollah, just like hamas. it's very tense. the bottom line is the best way to keep things in check is not to let them go unanswer. >> does the u.s. need to brace for other iran-backed proxied, hezbollah, various iran-backed militias in iraq and syria, hamas in gaza, for example, should the u.s. brace for them to respond as well? >> i think everybody right now is aware that every day you're facing risks both from hezb...

The houthis between drones and missiles have shot in the direction of u.s. ships, military ships and of course have gone after u.s.-owned ships. so the bottom line is in this case i think the president was completely right to respond. you can't let this go on unanswered. and as the president also said today wolf which i think is important iran does not want war with the united states but these are their proxies. they're backing the houthis and are behind this and they can't go unanswer. >> how do you expect them to retaliate? >> we'll see. we'll see what they've been doing now for weeks. firin...