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Sen. Jeff Flake ripped the Trump administration's decision to fire FBI official Andrew McCabe and echoed another Republican's warning that the special election loss in Pennsylvania was a "five-alarm fire" for the GOP.

Flake (R-Ariz.) recalled how the firing of McCabe -- who had served as deputy director of the bureau until January -- was lauded by Trump as a "great day for democracy."

"I think it was a horrible day for democracy," Flake told CNN, warning that Congress will not accept more key firings, including any potential dispatching of Special Counsel Robert Mueller.

"I hope that somebody does challenge the president [in 2020]," he said, adding that a Pennsylvania Republican who is also critical of Trump called the party's recent loss in a special election there a "five-alarm fire."

Rep. Charlie Dent of Allentown said Saturday that, 300 miles to his west, Rick Saccone's apparent loss to Democrat Conor Lamb in the race to replace Rep. Tim Murphy (R-Pa.) had to do in part with the "toxic political environment we find ourselves in."

Host Jake Tapper noted that Flake spoke Friday at a famous gala in New Hampshire's largest city that is popular with politicos seeking to make a name nationally ahead of the state's first-in-the-nation primary.

Flake said his appearance at the Politics & Eggs Breakfast in Manchester was not a campaign announcement, but more an opportunity to speak to Americans about his concerns with the current political scene.

"People want to remember the Republican Party as 'the decent party' and it's not [that] right now," Flake told Tapper. "There is a crying need out there for some Republicans to stand up and say 'this is not normal - this is not right'."

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