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Former White House chief strategist Steve Bannon has launched a war on the GOP establishment, and he will be backing primary challengers in a bid to defeat incumbent Republicans whom he views as Washington insiders who are unwilling to support President Donald Trump's agenda.

Fox News political analyst Gianno Caldwell said he finds it "disheartening" that Bannon is going after lawmakers like Senate Majority Leader Mitch McConnell (R-KY), who may not like Trump personally but are committed to passing his agenda.

He pointed out that the biggest accomplishment of Trump's presidency thus far - the appointment of Neil Gorsuch to the Supreme Court - was made possible by McConnell, who held up the process until a new president was in office, and then used the "nuclear option" in the Senate to get Gorsuch confirmed.

"I don't think this is something we should really be focusing on, especially when we've got 25 Democrats that are up for re-election right now," Caldwell said on "Fox News Tonight." "We should be focusing on defeating the Democrats and not defeating each other."

Former Ohio State Senator Capri Cafaro (D) said the Democratic Party is facing this same problem, with the progressive wing of the party pushing for more liberal primary challengers.

"We're going to end up with extremes on both sides," Cafaro said. "And what does that mean? That means when you get to the general election, particularly in a statewide race like a Untied States Senate race, it becomes less likely that you're going to be successful in winning that general election."

"And guess what?" she added. "If you don't win, you can't actually change the policy agenda in Washington."

Watch more above.

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