3 PM ET: GOP debate drama, US strikes Houthis again, Elon Musk's ask & more

The Iowa caucuses left three Republican presidential candidates standing – and it's unclear whether two of them will debate in New Hampshire this week. The US carries out additional strikes against Houthis in Yemen today. The Israel military's strategy in Gaza appears to be shifting, as the humanitarian crisis deepens in the enclave. The Biden administration slammed Texas again over its handling of the southern border in a new Supreme Court filing. Plus, Elon Musk wants a raise at Tesla.

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