Former President Trump dominated the Iowa caucuses with Florida Gov. Ron DeSantis finishing second, ahead of former South Carolina Gov. Nikki Haley. The focus shifts to next week's New Hampshire primary where the Trump campaign is sharpening their attacks against Haley, who is rising in the polls. CNN National Correspondent Kristen Holmes joins AC360 live from Trump's event in Atkinson, New Hampshire. Plus, Gilgo Beach serial killings suspect Rex Heuermann was charged with a fourth murder. Heuermann is accused of killing the four women called the "Gilgo Four" but has pleaded not guilty to all the charges. CNN Correspondent Jean Casarez tells Anderson Cooper who the fourth victim was and how prosecutors say DNA evidence was able to connect the bodies to Heuermann.

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