(CNN) Bob Woodward has covered eight presidents -- including one who he helped force out of office thanks to his reporting about Watergate. Which means that when he talks, you should listen. And when he says he's never seen anything like what he saw reporting out "Fear: Trump in the White House" -- his book out tomorrow -- then you should stand up and pay attention.

"I've never seen an instance when the President is so detached from the reality of what's going on," Woodward told NBC's Savannah Guthrie in a Monday interview, adding: "This has not been treated seriously enough. Some of the things Trump did and does jeopardize the real national security."

It's easy to get lost in exaggerations and superlatives when talking about President Donald Trump. He claims everything he does is the biggest, the first, the best. And given how norm-busting Trump's presidency is -- in terms of his relationships to the media, to his own party, to policy -- it's also difficult to avoid making mountains out of everything, even those things that might be molehills.

That said, consider what we are talking about here: One of the two reporters primarily responsible for a series of stories detailing corruption at the highest level of the Nixon government and a man who has spent the last four decades reporting and chronicling how each successive president since Nixon has dealt with the immense challenges of the office, is now suggesting that what he saw in the Trump White House is unlike what he's seen before.

That's a big deal -- especially because it confirms much of the daily reporting that has come out of this White House since Trump became President 19 months ago.