Bill Weld: GOP senators will be voted out in 2020 if they 'march in lockstep behind Trump'

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Fmr. Massachusetts Gov. Bill Weld, currently running as a primary challenger to President Donald Trump for the Republican nomination for president, speaks to Alex Witt about impeachment. Weld says that any GOP senators up for election in 2020 will be voted out of office if they "march in lockstep behind Trump, irrespective of the evidence" at an impeachment trial.