Veteran journalist Carl Bernstein on Sunday said that the Trump presidency has been "teetering" since the beginning with an "unstable president," referencing reporting in an upcoming book by his former Watergate-era partner, Bob Woodward.

"The Nixon presidency in its final days was teetering with an unstable president," Bernstein said on CNN's "Reliable Sources."

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"This president, if you read this book carefully, has been teetering from the beginning with an unstable president," he said.

Bernstein has spent the past week defending Woodward's reporting, which the White House has written off as "fabricated stories."

"The bulk of the book is astonishing detail, piled upon detail, of meetings, of memoranda, in which those closest to the president of the United States make it clear that they believe that the country needs to be saved from Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE and from his presidency," Bernstein said during the Sunday interview on CNN.

"Saved from his ignorance, saved from his lies, saved from his unwillingness to do the hard work of being president," he added. "It’s an unprecedented situation. It’s very different than ... Bob’s other books on the presidents and presidencies, including our books together about the Nixon presidency."

Woodward in a CBS interview on Sunday said his reporting should serve as a warning, adding "people better wake up to what’s going on" in the Oval Office

Woodward and Bernstein, who gained fame for their Watergate reporting, co-authored multiple books about the Nixon presidency including "All The President's Men" and "The Final Days."