New evidence in the Ukraine affair has revealed several important new facts. One is that President Trump’s firing of U.S. Ambassador to Ukraine Marie Yovanovitch last spring was part of an explicit trade-off with a corrupt Ukrainian prosecutor who promised dirt on Joe Biden. Another is that Mr. Trump’s demand that Ukraine’s president announce an investigation of Mr. Biden, along with the threat of retaliation if he did not, was communicated to the Ukrainians months earlier than previously known.

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