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The Republican FISA surveillance memo reveals the biggest case of abuse of power in U.S. history, Sean Hannity said in his opening monologue tonight.

The memo contains a number of allegations, including that the FBI and Justice Department relied on the infamous anti-Trump dossier to secure FISA surveillance warrants to spy on at least one member of the Trump team.

It also claims the former British spy who compiled the dossier, which was funded by the Hillary Clinton campaign and the Democratic National Committee, had a personal animus for President Donald Trump.

Hannity said the memo proves that Special Counsel Robert Mueller's Russia investigation was based on lies and "needs to be shut down immediately."

He explained the FBI allegedly used the unverified dossier to "mislead and purposefully deceive" a federal court, in order to hurt Trump's presidential campaign and help Clinton's.

"That type of abuse of power, that type of corruption, that shredding of the Constitution, it is unprecedented in American history," Hannity said.

He said that Mueller's investigation has been a witch hunt from the beginning, and it was built on a house of cards that is now crashing down.

"If we care about the Constitution, if we believe in civil liberties, if we believe in those protections, then the special counsel must be disbanded immediately."

Watch Hannity's powerful monologue above.

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