Longtime McCain aide: ‘Vote For the Democrat (in most cases)’
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Mark Salter, the former chief of staff and speechwriter for the late Republican Sen. John McCainJohn Sidney McCainTrump stokes new unlikely feud Meghan McCain: Living without father like 'some awful parallel universe' Leon Panetta’s nightmare is today's national security crisis MORE (Ariz.), called on voters to vote Democratic on Election Day. 

“Vote For the Democrat (in most cases),” Salter wrote on Twitter early Tuesday morning.

“That feels weird to write,” the ex-McCain staffer continued. “But the bigger the rebuke of Trump the better for the country. Resist.”

Salter's comments arrive as polls across the country open on Election Day with many waiting in anticipation to see whether a blue wave for Democrats will emerge in the first national elections since President TrumpDonald John TrumpPaul Ryan defends Navy admiral after Trump's criticism Trump discussing visit overseas to troops following criticism: report Retired Army General: Trump is ‘acting like an 8th grader’ in attacking ex-Navy SEAL who led bin Laden operation MORE took office.

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Salter, a longtime critic of the president, sparked headlines back in 2016 when he tweeted that he would back Democratic presidential nominee Hillary Clinton over Trump in the weeks leading up to the presidential election.

He’s also called out Trump for his "unstable personality” and recently dismissed Trump's attacks on the then-ailing McCain in May, saying on Twitter at the time that “the Senator doesn't give a rat's ass what this particular president says or thinks about him.” 

McCain, another frequent critic of Trump's, died in August, about a year after being diagnosed with brain cancer.