U.S. President Donald Trump said on Saturday that the White House would probably release a transcript of a second call with Ukrainian President Volodymyr Zelensky on Tuesday.

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"We have another transcript coming out which is very important," Trump told reporters at Joint Base Andrews before leaving for a visit to Tuscaloosa, Alabama, as reported by Reuters.

"I will give you a second transcript, because I had two calls with the president of Ukraine," he said.

Trump said the second transcript would probably be released on Tuesday.