In this Monday, Jan. 23, 2017 file photo, former White House press Secretary Sean Spicer speaks during the daily White House briefing at the White House in Washington. Credit: Evan Vucci | AP

Sean Spicer says he’s a “very self-critical person.” And when he looks back on his time as the embattled White House press secretary, he has a few regrets.

“There were times where I screwed up, there’s no question about it,” he told conservative commentator S.E. Cupp on HLN on Thursday.

First and foremost among these times, he said, was his infamous assertion that the crowd size at Trump’s inauguration was the largest ever.

“What I said is ‘the largest audience to ever witness an inauguration in person or around the globe,’ ” Spicer told Cupp. “The fact of the matter is that there are platforms like Twitter and Facebook and Instagram that were not available in previous administrations.”

But, he added: “What I do regret is that we didn’t emphasize those points enough. We focused too much on the pictures.” He has previously also said he regrets berating the news media for accurate reports that President Barack Obama’s inauguration crowd was bigger than President Trump’s.

The Washington Post’s fact-checker gave Spicer’s statement four Pinocchios at the time, the worst rating, reserved for “whoppers.”

There was also the time he criticized Syrian President Bashar Assad’s use of chemical weapons, and ended up downplaying the horrors of the Holocaust. Spicer said that even Adolf Hitler did not sink to that level of warfare and “was not using the gas on his own people in the same way that Assad is doing,” despite Hitler’s use of gas chambers to kill millions of Jews and others.

“I screwed that up royally,” Spicer told Cupp, adding that “when I screwed up, yeah, it felt really bad.”

“You realize that you’re tarnishing your personal reputation, your family’s reputation, your friends who like and support you, some of your colleagues and ultimately . . . this administration and the American people.”

Indeed, Spicer has been asked numerous times in recent months to open up about his missteps and regrets from his time in the White House. Jimmy Kimmel mocked him to his face about the inauguration crowd size remarks. He even poked fun at his own claims in a controversial cameo at the Emmys.

“I honestly went out every day to do the best job I could for the president of the United States who gave me an unbelievable honor,” he said.

Asked by Cupp on Thursday if he ever blatantly lied on behalf of the president, Spicer said he had not.

“There’s no question that sometimes . . . information changed as facts became available to us . . .,” he said, but added that “at no time did I go up and say something that was . . . demonstrably false.”

Spicer argued that “there was an intensity and a scrutiny that has never been seen before in a White House.”

He said that while the role of White House press secretary was his dream job, he quickly realized his boss would be unlike any of his predecessors’ bosses. He needed to adapt to the style of an unconventional president – a task that he admitted was “absolutely” difficult.

Spicer, whose tenure was marked by a contentious relationship with the press, resigned in July after clashing with Trump over the appointment of Anthony Scaramucci as communications director.

He has since announced that he will be releasing a book in the summer to “set the record straight” about his time with the Trump administration. The book, titled “The Briefing,” will be released on July 23.

But on Thursday, most of the conversation in Washington surrounded a different book: Michael Wolff’s “Fire and Fury: Inside the Trump White House.”

Asked about the scathing portrayal of the Trump administration in book excerpts, Spicer said: “There is no question that the accuracy of this book is definitely in question.”

He said the idea that Melania Trump was crying “is nonsense.” He asserted that several quotes attributed to him and to other people “frankly never happened.” And he said he was troubled that Steve Bannon, Trump’s former chief strategist, had not denied the unflattering quotes attributed to him in the book.

“While he may continue to say he’s a supporter of the president and his agenda, what we didn’t hear is a denial,” Spicer said.

“You don’t attack the president’s family,” he added.