Democrats release key witness testimony transcripts; Four WH officials refuse to appear for testimony; Muller docs: Manafort pushed conspiracy theory blaming Ukraine for 2016 election interference; New poll shows Trump in tight races with top democrats

Ex-ambassador to Ukraine said she felt threatened by Trump; Testimony: former ambassador to Ukraine was told to show support for Trump; Testimony: ex-ambassador said Ukrainians told her to watch her back; Trump: "the whistle blower should be revealed"; Lawyer: whistleblower willing to answer written GOP questions; Trump: written answers from whistleblower not acceptable; Dems gear up for public phase as WH defies subpoenas; WAPO: GOP senators consider acknowledging Trump's quid pro quo; Muller docs: trump repeatedly pushed for stolen Clinton emails during 2016 election; Swing state democrats in Wisconsin aren't talking impeachment; Wisconsin GOP thinks impeachment will help Trump; Democrats try to flip Wisconsin again after Trump's 2016 win; Warren faces escalating attacks from fellow 2020 democrats over new "Medicare for All" plan; Warren pushes back against criticism of her "Medicare for All" plan; Trump loses appeal to keep taxes secret, judge dismisses immunity claim;

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