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and his top republican rivals are swarming the campaign trail tonight with 2024 almost here. we re getting a new read on the former president s confidence heading into the iowa caucuses. his campaign already predicting when he ll clinch the gop nomination. also tonight, a major legal challenge to a strict and sweeping new immigration law in texas. will civil rights groups be able to block the measure that authorizes police in texas to arrest migrants? a stunning explosion of red-hot lava as a volcano erupts in iceland. cnn is right near the danger zone getting updates on the threat from the oozing inferno and the toxic gases spewing into the air? welcome to our viewers here in the united states and around the world. i m wolf blitzer. you re in the situation room. we begin with presidential politics at an all-out push for votes in iowa tonight. the top three republican candidates are getting ready to hold events in the lead-off caucus state. front-runner donald t ....