The House Intelligence Committee has released the "Nunes memo" about the Russian investigation.

President Donald Trump authorized the release Friday despite objections from the FBI, Department of Justice and Democrats. The four-page document was written by GOP lawmakers including Rep. Devin Nunes (R-CA) and alleges the FBI abused its power in surveilling Trump during the 2016 presidential campaign.

According to Fox News, the memo includes testimony from a high-ranking government official who claims the FBI and DOJ would not have secured FISA warrants to watch members of Trump's campaign team without the infamous "Steele dossier." Republicans say it's evidence of FBI misconduct and taints special counsel Robert Mueller's investigation into allegations Russians colluded with the Trump team to interfere in the election.

The memo, prepared by Republicans on the House intelligence committee, claims there was "a troubling breakdown of legal processes" in the investigation. The Associated Press reports it also asserts that opposition research, conducted by a British spy and funded in part by the Democratic National Committee (after Republicans initially funded it) and Clinton campaign, formed a critical basis for the allegations contained in the warrant application.

Trump, who has called the investigation a "witch hunt," has supported the release of the memo in the apparent hopes that it could help undermine the probe.

"The top Leadership and Investigators of the FBI and the Justice Department have politicized the sacred investigative process in favor of Democrats and against Republicans - something which would have been unthinkable just a short time ago. Rank & File are great people!" Trump tweeted.

"A lot of people should be ashamed of themselves," Trump told reporters Friday. "I think it's terrible... I think it's a disgrace. What's going on in this country, I think it's a disgrace."

The FBI said it had "grave concerns" about the memo's accuracy, saying it misses critical context.

Democrats also say it cherry-picks intelligence in an effort to smear the FBI and Department of Justice.

"This is designed to impugn the credibility of the FBI, to undermine the investigation, to give the president additional fodder to attack the investigation. And it's a tremendous disservice to the American people," Rep. Adam Schiff, the senior Democrat on the House Intelligence Committee, said on CBS "This Morning."

Read the memo text in full: