Iowa Caucuses Arrive As Impeachment Trial Enters Final Stage

The first test of the 2020 presidential campaign comes on Monday as the Senate begins closing arguments in the impeachment trial of President Trump. The winner will get a major boost going into the next week's primary in New Hampshire.

Polls show Joe Biden and Bernie Sanders with an edge on other top candidates, though many caucus-goers remain undecided.

NPR's Don Gonyea (@DonGonyea) talks to Tonya Mosley about what to expect Monday night.