Tonight's Democratic debate in Iowa is the last before voting begins, but it remains a highly unpredictable contest.

There is some disagreement between candidates Elizabeth Warren and Bernie Sanders, with Warren claiming Sanders told her during a private meeting that he did not believe a woman could beat Donald Trump in 2020, something Sanders denies.

Cal Thomas and Marion McKeone discussed this and more in our US slot.

Listen to the interview in full by pressing the play button on this page.