The memorandum on President Trump’s July 25 phone conversation with Ukrainian President Volodymyr Zelensky is a devastating indictment of the U.S. president. In it, Mr. Trump presses the neophyte Ukrainian leader to join with his personal lawyer and the U.S. attorney general in investigating his potential opponent in the 2020 election, Joe Biden. He does so after underlining the support the United States provides for Ukraine and after complaining that Ukraine has not adequately reciprocated.

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