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UPDATE: A controversial memo alleging U.S. government surveillance abuses was declassified by the White House on Friday.

Fox News chief intelligence correspondent Catherine Herridge summarized some of the first excerpts.

Watch her analysis, here.

In his opening monologue Thursday night, Sean Hannity said Democrats and the mainstream media are breathlessly trying to discredit a controversial memo on purported U.S. government surveillance abuses.

As early as Friday morning, President Donald Trump is expected to declassify the memo, which some House Republicans have claimed contains "disturbing" information on how FISA surveillance was used to target the Trump campaign.

Hannity pointed out there has been speculation that the memo reveals the infamous anti-Trump dossier -- which came from research funded in part by the Democratic National Committee and the Hillary Clinton campaign -- was used by the FBI to obtain FISA surveillance on Trump associates.

"Democrats and the media, they are now hyperventilating and breathlessly doing everything they can possibly do to discredit and stop the memo from being released," Hannity said.

What Is the FISA Memo? 6 Things to Know About the Secret Document

He said that Democratic leaders like Senate Minority Leader Chuck Schumer (D-N.Y.), House Minority Leader Nancy Pelosi (D-Calif.) and Rep. Adam Schiff (D-Calif.) have attacked the memo in "one big lying echo chamber."

Those talking points have quickly been adopted by Democratic "allies" in the media, Hannity said.

"If the media had any ethical standards left and if they really cared about truth, if they cared about the American people, if they believed in transparency, they would have been all over this story, demanding on behalf of the American people that the memo be released," he said.

He added this scandal will make Watergate "look like a parking ticket," but you'd never assume that based upon how it's being covered.

Watch more above.

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