Donald Trump has a day in court and his legal team argues that the former president cannot be prosecuted even if his actions were criminal. Plus, with six days before the crucial contest in Iowa, a new CNN poll from another key early primary state shows a candidate gaining ground on the GOP frontrunner. Also, the defense secretary has been treated for prostate cancer. The Pentagon has been pressed on his hospital status and why the president didn't know one of his top cabinet members was in the hospital and couldn't do his job.
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