"It's a very dangerous precedent, and I think it's going to really harm any president, whether it's this president or a future president's ability to talk to world leaders candidly," Johnson told reporters on Monday.

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He added that releasing the call transcript "would be the worst possible precedent."

"This is not something that Congress necessarily has to have its hands on," he said.

The president is facing calls, including from some within his own party, to release the transcript of his conversation with Zelensky, which is reportedly linked to a whistleblower complaint.