AdvertisementLooming Impeachment Trial Adds Urgency To Senators' Campaign Push03:40Download AudioResumeJanuary 20, 2020Scott DetrowfacebookEmailDemocratic presidential candidate and Minnesota Sen. Amy Klobuchar speaks during a campaign event Sunday in Des Moines, Iowa. President Trump's impeachment trial will pull her and three other candidates off the trail at a critical juncture. (AP)