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crucial so race tomorrow and will take you to the southern border tonight. >> we're a small community straddles both sides of a dangerous part of the border. >> what they're witnessing every day, and what they think here is still to come let's go out front and good evening. i'm erin burnett outfront tonight, demanding a drug test. >> so for president trump now says president biden should be tested for drought he's saying this three days before the presidential debate right here on cnn and all caps, trump tonight, writing online quote, drug tests for cookie jar so biden three exclamat...

>> malecon lance, thank you. appreciate your time on this start. we are a little more than two moss away from the iowa caucuses. the front-runner joe biden, upping his ground day with an eight-day bus tour across iowa making a personal appeal to voters in a key state he's recently fallen in polls. according to compile data from real clear politics, mayor buttigieg is leading with 24% followed by bernie sanders 18% and elizabeth warren there at 17% and then biden trailing at 16%. nbc news road warrior mike memoli is with the biden campaign and joins us. what's the goal of his eight-day bus to...