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 McCainMeghan McCain on Pelosi-Trump feud: 'Put this crap aside' and 'work together for America' Meghan McCain says Ben Carson should be developing brain cancer treatment, not working at HUD Graham urges Trump not to abandon infrastructure talks with Democrats 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 TrumpNASA exec leading moon mission quits weeks after appointment The Hill's Morning Report — After contentious week, Trump heads for Japan Frustration boils over with Senate's 'legislative graveyard' 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.