President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE on Thursday touted a report saying the FBI under former President Obama spied on the Trump campaign during the 2016 presidential race, saying that the revelation could be "bigger than Watergate."

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“Wow, word seems to be coming out that the Obama FBI 'SPIED ON THE TRUMP CAMPAIGN WITH AN IMBEDDED INFORMANT,'" the president tweeted in reference to a National Review report published last week.

“Andrew McCarthy says, 'There’s probably no doubt that they had at least one confidential informant in the campaign.' If so, this is bigger than Watergate!”

Wow, word seems to be coming out that the Obama FBI “SPIED ON THE TRUMP CAMPAIGN WITH AN EMBEDDED INFORMANT.” Andrew McCarthy says, “There’s probably no doubt that they had at least one confidential informant in the campaign.” If so, this is bigger than Watergate! — Donald J. Trump (@realDonaldTrump) May 17, 2018

The report alleges that Obama-led agencies used their surveillance powers to monitor the Trump campaign.

This is not the first time that the Obama administration has been accused of spying on the Trump campaign.

Last year, Trump accused the former president of wiretapping Trump Tower shortly before the 2016 election.

“Terrible! Just found out that Obama had my 'wires tapped,' in Trump Tower just before victory. Nothing found. This is McCarthyism!" the president tweeted in March 2017.

Terrible! Just found out that Obama had my "wires tapped" in Trump Tower just before the victory. Nothing found. This is McCarthyism! — Donald J. Trump (@realDonaldTrump) March 4, 2017

Former White House press secretary Sean Spicer Sean Michael SpicerKellyanne Conway to leave White House at end of month Pro-Trump duo Diamond and Silk launch new program on Newsmax TV The Hill's 12:30 Report - Presented by Facebook - Supreme Court's unanimous decision on the Electoral College MORE later walked back the president's claim, saying he did not mean that Obama literally wiretapped Trump Tower.

"The president used the word 'wiretap' in quotes to mean broadly surveillance and other activities during that," Spicer said. "There is no question that the Obama administration, that there were actions about surveillance and other activities that occurred in the 2016 elections."