With their candidates stuck in Washington for the Senate impeachment trial of President Trump, campaign staffers, organizers and surrogates for Sens. Bernie Sanders (I-Vt.), Elizabeth Warren (D-Mass.) and Amy Klobuchar (D-Minn.) are under pressure to help make closing arguments before the Iowa caucuses on Feb. 3.

The trial kicked off this week and will keep senators in session for six days a week, although it‘s set to end early afternoon on Saturday, allowing the 2020 Senate candidates to travel to Iowa for the weekend.