Rep. Devin Nunes Devin Gerald NunesSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Sunday shows preview: With less than two months to go, race for the White House heats up Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (R-Calif.) broke with President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE on Saturday and welcomed Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE's decision to ask the Justice Department's inspector general to investigate alleged abuses of the Foreign Intelligence Surveillance Act (FISA).

Nunes, who chairs the House Intelligence Committee that is investigating Russian interference in the election, told Fox News that he welcomed Sessions's announcement that his department's internal watchdog, Michael Horowitz, would investigate alleged improper surveillance of the Trump campaign.

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"I welcome anybody to help come investigate because so far it's only the House Intelligence Committee Republicans who are actually doing anything to get to the bottom of who was colluding with Russia," Nunes said.

"I was happy to see Attorney General Jeff Sessions appoint Mr. Horowitz, because we welcome more people investigating these serious issues that we're working on."

Nunes, whose staff authored a controversial memo alleging surveillance abuses, claimed that Republicans on the committee have uncovered "clear evidence" of collusion between the Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE campaign, the Democratic National Committee and Russia during the 2016 campaign.

"The more we pull this back, we have clear evidence of collusion, but it's not between the Trump campaign, it's between the Democratic Party and the Hillary campaign and the Russians," Nunes asserted.

Nunes's comments follow a tweet from the president attacking his own attorney general for asking Horowitz to handle the investigation of the alleged FISA abuses detailed in the memo issued earlier this year by Republicans on the Intelligence Committee.

"Why is A.G. Jeff Sessions asking the Inspector General to investigate potentially massive FISA abuse," Trump tweeted earlier this week. "Will take forever, has no prosecutorial power and already late with reports on Comey etc. Isn’t the I.G. an Obama guy? Why not use Justice Department lawyers? DISGRACEFUL!"

The chairman of the House Oversight and Government Reform Committee, Rep. Trey Gowdy Harold (Trey) Watson GowdySunday shows preview: Election integrity dominates as Nov. 3 nears Tim Scott invokes Breonna Taylor, George Floyd in Trump convention speech Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (R-S.C.), also defended Horowitz this week, saying he had "complete confidence" in the DOJ watchdog.

“He was confirmed by the U.S. Senate without a single dissent. I have complete confidence in him," Gowdy said.