Michael Mukasey, who served as attorney general under former President George W. Bush, dismissed speculation that former national security adviser Michael Flynn’s plea agreement signals that there are more charges to come in the special counsel’s Russia probe.

“A lot of the heavy breathing and a lot of the speculation is completely unwarranted,” Mukasey told ABC News’s “This Week.”

“That plea agreement does not, to me, indicate that there’s very much else there.”

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Mukasey’s remarks come after Flynn pleaded guilty to lying to the FBI about his conversations with the Russian ambassador to the U.S.

Flynn is the first former official in the Trump administration to be brought down by special counsel Robert Mueller’s investigation into Russia’s election meddling and any potential ties between the Trump campaign and the Kremlin.

Former Trump campaign chairman Paul Manafort and one of Manafort's former business associates pleaded not guilty in October to the charges unveiled in an indictment.

A former Trump campaign foreign policy adviser, George Papadopoulos, also pleaded guilty to lying to the FBI about his interactions with officials close to the Russian government.