Third-party presidential candidate Evan McMullin defended Arizona 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 on Sunday evening, after Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE called Flake “weak” on Twitter.

McMullin tweeted that the GOP presidential nominee “demonstrates his fragility” by attacking Flake, whom he called “one of America’s most courageous leaders.”

.@realDonaldTrump demonstrates his fragility once again by attacking @JeffFlake, one of America's most courageous leaders. — Evan McMullin (@Evan_McMullin) September 4, 2016

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Flake said Sunday that he still cannot vote for the Republican presidential nominee.

"I would not vote for [Democratic nominee] Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE — and as of now, I would not vote for Donald Trump,” he said on CNN’s “State of the Union.”

“You can always write someone in," he said.

McMullin followed his first tweet with a second that included a fundraising link for Flake’s campaign.

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