Their work on the statement is new evidence of how Mr. Trump’s fixation with conspiracy theories linked to Ukraine began driving senior diplomats to bend American foreign policy to the president’s political agenda in the weeks after a July 25 call between the two leaders.
The statement was worked on by Gordon D. Sondland, the United States ambassador to the European Union, and Kurt D. Volker, then the State Department’s special envoy to Ukraine, according to the documents and the three people who have been briefed on the statement. Rudolph W. Giuliani, Mr. Trump’s personal lawyer and the de facto leader of a shadow campaign to push the Ukrainians to press ahead with investigations, provided the critical element of the language, Mr. Volker told House Democratic investigators on Thursday, a person familiar with his testimony said.