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 McCainOvernight Defense: Trump unveils new missile defense plan | Dems express alarm | Shutdown hits Day 27 | Trump cancels Pelosi foreign trip | Senators offer bill to prevent NATO withdrawal Bipartisan senators reintroduce bill to prevent Trump from withdrawing from NATO Mark Kelly considering Senate bid as Arizona Dems circle McSally 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 TrumpTrump directed Cohen to lie to Congress about plans to build Trump Tower in Moscow during 2016 campaign: report DC train system losing 0k per day during government shutdown Senate Republicans eye rules change to speed Trump nominees 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.