Washington (CNN) President Donald Trump's longtime confidante Roger Stone will testify before the House intelligence committee on July 24 in a closed session.

Stone's expected testimony follows news that Democratic nominee Hillary Clinton's 2016 presidential campaign chairman John Podesta on Tuesday met with House investigators digging into Russia's efforts to alter the 2016 elections.

"I am confident that Podesta most likely repeated his lie that I knew in advance about the hacking of his email, and am anxious to rebut this falsehood," Stone said in a statement to CNN on Tuesday. "I am still unhappy that my testimony will not be in public, but believe it is more important to resolve the question of Russian collusion with the Trump campaign -- which I believe was nonexistent."

Stone has repeatedly called for an opportunity to testify in an open session. But a source familiar with the matter said the committee decided to keep the hearing closed.

"It was the decision of the committee," the source said. "We asked for open and they declined."

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