The New York Times reported separately this week that at least one government informant met several times with Carter Page and George Papadopoulos, both former foreign policy advisers on Trump's Republican campaign. "But the lead that they buried is - the word that you nearly never see in the Times [piece] ... is counterintelligence".
"Congratulations America, we are now into the second year of the greatest Witch Hunt in American History... and there is still No Collusion and No Obstruction", he wrote Thursday.
"If so, this is bigger than Watergate!" he tweeted. "This has never been done before and by any means necessary, they are out to frame Donald Trump for crimes he didn't commit".
Trump quoted McCarthy speaking on Fox News about his latest articles, in which he argued Fusion GPS co-founder Glenn Simpson was referring to an Federal Bureau of Investigation spy during Senate Judiciary Committee testimony.
Despite the fact that House Republican's repeated requests for sensitive information on the origins of the Russian Federation investigation reportedly risk endangering the life of a crucial FBI informant, President Donald Trump's allies are still pushing to have the underlying facts revealed, according to a new report in the Washington Post.
Trump's tweet refers to an article penned by McCarthy and published by National Review on Saturday.
Mr Trump also praised his administration, calling it "the most successful first 17 month Administration in U.S. history - by far!"
Trump, his attorney Rudy Giuliani and White House officials have seized on the matter in an effort to undermine the probe of special counsel Robert Mueller. "Sorry to the Fake News Media and 'Haters, ' but that's the way it is!"
If Comey was involved, said Giuliani, "he should be prosecuted..."
"It's about time to say enough".
Giuliani, who is working for the president pro bono, said Wednesday that the probe "is not good for the American people, and the special counsel's office doesn't seem to have that sort of understanding that they're interfering with things that are much bigger than them".