Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style MORE (R-Ariz.) said Sunday that 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 seems to be building toward firing 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 after FBI Deputy Director Andrew McCabe Andrew George McCabeGraham: Comey to testify about FBI's Russia probe, Mueller declined invitation Barr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' GOP votes to authorize subpoenas, depositions in Obama-era probe MORE was dismissed Friday.

“It was a horrible day for democracy. To have firings like this happening at the top from the president and the attorney general does not speak well for what’s going on,” Flake said on CNN’s “State of the Union.”

Asked if he believes the president is laying the groundwork to fire Mueller, Flake said “it seems to be building towards that. But I just hope it doesn’t go there, because it can’t.”

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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 fired McCabe on Friday, just days before the ex-FBI official was set to retire and be eligible for his pension. Trump has personally attacked McCabe in the past, and celebrated his firing as "a great day for democracy."

Trump also took to Twitter this weekend to double down on his long-held opposition to the Mueller-led investigation into Russian interference in the 2016 election. He asserted Saturday that the probe “should never have been started.”

On Sunday, he claimed Mueller’s team is entirely made up of Democrats. Mueller himself is a Republican.

Flake on Sunday called any attempts to fire Mueller a “massive red line” that he believes fellow Republicans would push back against.

Flake, who has frequently criticized Trump’s rhetoric and is not seeking reelection this year, has prompted speculation that he might launch a White House bid in 2020. Flake, 55, spoke in New Hampshire on Friday at an event that typically hosts future presidential candidates.

On Sunday, Flake did not provide further clarity on his future plans, but reiterated his hope that a Republican will challenge Trump.

“What I’m seeing is there is a crying need out there for some Republican to stand up and say ‘this is not normal, this is not right,’ ” Flake said.