"I'll wear this as a badge of honor," Cindy McCain said.
The Arizona GOP is to vote on censuring the three prominent Republicans from the state, despite disapproval from the Republican National Committee's chairwoman.
"How many injuries to American democracy can my Republican Party tolerate, excuse and champion?" Flake wrote in a New York Times op-ed published Wednesday.
The former Senator for Arizona Jeff Flake told BBC's Newsnight that Republicans "are still playing to that audience of one, not knowing where the Trump base will go."
"When you fill out your own ballot, ask yourself, 'Who will best restore decency and civility to the White House? Who can I be proud to tell my children and grandchildren I voted for?'" Jeff Flake said.
Republicans have served as Defense or War Secretary for more than half of the 40 years of Democratic administrations.
Former Republican National Committee Chairman Michael Steele is the latest to join the expanding bloc of high-profile GOP figures endorsing the Democratic nominee.
"Preserving the institution of the Senate should be paramount to any political gain," Flake tweeted.
"These former members of Congress cited Trump's corruption, destruction of democracy, blatant disregard for moral decency, and urgent need to get the country back on course," the Biden campaign said.
The former governor died hours after her husband on Thursday.
"But I think anyone voting on the facts, anyone voting on the law, this is a very easy vote," the senator from Texas argued.
"At this point, the president's conduct in office should not surprise us. But truly devastating has been our tolerance of that conduct," Flake wrote in an op-ed.
Trump has no shortage of opponents, but here are some Republicans who have made their opposition known.
"What I would like is for the Republican Party to nominate someone else."
Barkan, who has ALS, once confronted Senator Jeff Flake on a plane about proposed tax cuts.
Another four years of Trump could doom the Republican Party for good, says former Arizona Senator Jeff Flake.
"Kyrsten Sinema won because she ran a good race and had a message that resonated with Arizona's voters," Flake said.
McConnell believed the measure to protect Mueller, a bipartisan bill that would curb Trump's ability to interfere with Mueller's investigation or to fire the special counsel, is "blatantly unconstitutional."
Flake's vote against advancing a judicial nominee came after GOP Senator Mike Lee blocked a move by Flake to bring a Mueller protection bill to the Senate floor for a vote, something GOP Senate Majority Leader Mitch McConnell has refused to do.
"At the end of the day, I am convinced that Mr. Mueller will be allowed to do his job," the senator said.
Republican senators have joined Democrats' calls to postpone Brett Kavanaugh's Supreme Court confirmation vote until the woman who has accused him of sexual assault can be heard by senators on the Judiciary Committee.
"Sorry, [Donald Trump]. I made no endorsement in this race," Jeff Flake responded on Twitter.
"And only a passing familiarity with how the Constitution works."
Former GOP communications director Tara Setmayer said Joe Arpaio's Senate run could be "Roy Moore part two."