Sondland plans to tell lawmakers he has no knowledge of whether the president was telling him the truth at that moment. “It’s only true that the president said it, not that it was the truth,” said the person familiar with Sondland’s planned testimony, who spoke on the condition of anonymity to discuss sensitive diplomatic matters.

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The person familiar with Sondland’s testimony said the ambassador “believed Trump at the time and on that basis passed along assurances” that Trump was not withholding military aid for political purposes.

But Sondland’s testimony will raise the possibility that Trump wasn’t truthful in his denial of a quid pro quo as well as an alternative scenario in which the president’s interest in the scheme soured at a time when his administration faced mounting scrutiny over why it was withholding about $400 million in security assistance to Ukraine and delaying a leader-level visit with Ukrainian President Volodymyr Zelensky.

“Whether he’s deciding it’s getting too hot to handle and he backs off whatever his position really was a month earlier, I don’t know,” the person said of Sondland’s understanding.

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Sondland is expected to say that for months before the Sept. 9 message, he worked at the direction of Rudolph W. Giuliani, Trump’s personal attorney, to secure what he would call in another text message the “deliverable” sought by Trump: a public statement from Ukraine that it would investigate corruption, including mentioning Burisma, a Ukrainian energy company, by name. In exchange for the statement, the president would grant Ukraine’s new president a coveted White House audience.