A U.S. flag in flames as massive protests break out in Iran following U.S.-led airstrikes in Yemen. Tonight, President Biden threatens more strikes to come. Plus, a CNN investigation, Gaza hospitals are on the edge of collapse. We have an in-depth look on what is actually happening inside those hospitals. Plus, Ron DeSantis is heading straight to South Carolina after Iowa even though New Hampshire comes first. John King joins to share what he's watching with three days until the Iowa caucuses.

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