The pre-Christmas campaign push lands in Iowa, with Donald Trump, Ron DeSantis and Nikki Haley all holding events there, sharpening their closing messages and attacks against each other. Plus, a new signal the Trump campaign is concerned about one candidate's growing momentum as the former president’s Super PAC rolls out an attack advert against Nikki Haley for the first time. And, Governor Abbott signs a controversial bill making illegal immigration a state crime that will allow Texas police to make mass arrests. Also, bursts of lava and smoke fill the sky in Iceland after a volcano dramatically erupts overnight after weeks of warnings, threatening a geothermal power plant.

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