A lifelong Republican and former aide during the Kenneth Starr investigation into President Clinton said he will be voting for a Democrat in a federal election for the first time in his life.

Paul Rosenzweig told CNN’s Matt Berman on Monday that his decision comes after the Republican Party's “abdication of responsibility.”

“The Republican Party, seems to me, to no longer deserve my support or frankly the support of anybody who thinks that the legislative branch should act as a check and balance against executive authoritarianism,” Rosenzweig said.

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Rosenzweig cited a tape which surfaced of Rep. Devin Nunes Devin Gerald NunesOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Trump nominates former Nunes aide to serve as intel community inspector general Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election MORE (R-Calif.), chairman of the House Intelligence Committee, suggesting a GOP majority in the House is needed to protect President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE from special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's Russia investigation.

“Essentially Rep. Nunes has said aloud what everybody was assuming, which is that his only goal and apparently the only goal of the party is to defend the president no matter what,” Rosenszwieg said.

“And that’s just not the right way for a legislative branch to function,” he added.

Nunes, speaking at a private fundraiser for Rep. Cathy McMorris Rodgers Cathy McMorris RodgersHillicon Valley: Trump backs potential Microsoft, TikTok deal, sets September deadline | House Republicans request classified TikTok briefing | Facebook labels manipulated Pelosi video Top House Republicans request classified TikTok briefing More than 100 lawmakers urge IRS to resolve stimulus payment issues MORE (R-Wash.) earlier this month, said that “if [Attorney General Jeff] Sessions won’t unrecuse and Mueller won’t clear the president, we’re the only ones.”

“Which is really the danger ... we have to keep all these seats,” he continued. “We have to keep the majority. If we do not keep the majority, all of this goes away,” Nunes said.

Rosenzweig, who also previously served in the Department of Homeland Security, said Nunes has lost his credibility as chairman of House Intelligence Committee.

“The intelligence committees in particular have a special responsibility to both maintain the security of the United States and protect our civil liberties,” Rosenzweig said on CNN.

“The fact that Congressman Nunes is so willing to forgo that responsibility completely in favor of defending the president really drains him and, I’m sad to say, the party that I’ve been a part of all of my adult life, of their moral authority,” he continued.

The Hill has reached out to Nunes's office for comment.

Rosenzweig said that a Democratic-controlled Congress would not serve his interests as a conservative but would maintain the nation’s “integrity.”

He is the latest Republican who said he will be voting against his party during November’s midterm elections.

He is joined by GOP strategist Steve Schmidt, former Washington Post columnist George F. Will and longtime conservative commentator Phil Heimlich in supporting Democrats.