MSNBC host Nicolle Wallace cut herself off mid-sentence while reading 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’s tweets on-air Friday, calling them "boldface lies."

“I’m not reading any more of this,” Wallace said with a laugh. “These are boldface lies and as his audacity and his sort of fantasies expand, I wonder what role you think the truth plays in this for any of them."

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Wallace had been reading a series of the president's tweets in which he again attacked the FBI's use of an informant during his campaign, suggesting the agency used a spy to monitor his team before it began its investigation into Russian meddling in the 2016 election.

Trump also accused Democrats of planting the informant in his campaign “for the sole purpose of political advantage and gain.”

"The Democrats are now alluding to the the concept that having an Informant placed in an opposing party’s campaign is different than having a Spy, as illegal as that may be," he tweeted. "But what about an 'Informant' who is paid a fortune and who 'sets up' way earlier than the Russian Hoax?"

"Can anyone even imagine having Spies placed in a competing campaign, by the people and party in absolute power, for the sole purpose of political advantage and gain?" he wrote in a second tweet. "And to think that the party in question, even with the expenditure of far more money, LOST!"

The Democrats are now alluding to the the concept that having an Informant placed in an opposing party’s campaign is different than having a Spy, as illegal as that may be. But what about an “Informant” who is paid a fortune and who “sets up” way earlier than the Russian Hoax? — Donald J. Trump (@realDonaldTrump) May 25, 2018

Can anyone even imagine having Spies placed in a competing campaign, by the people and party in absolute power, for the sole purpose of political advantage and gain? And to think that the party in question, even with the expenditure of far more money, LOST! — Donald J. Trump (@realDonaldTrump) May 25, 2018

No evidence has emerged that the FBI spied on Trump's campaign. The informant, identified in media reports as Stefan Halper, is an American academic who reportedly met with at least Trump three advisers in 2016.