Jeb Bush's campaign is out with a new ad painting a presidential nomination for Donald TrumpDonald TrumpPodesta: Trump 'unfit' for office Ukrainian oligarch could be missing link in Trump-Russia probe Trump's triumph in Riyadh proves America is back on top of the world MORE as a death knell for the Republican Party's chances of defeating Hillary ClintonHillary Rodham ClintonThe Hill's 12:30 Report Podesta: Trump 'unfit' for office Spike Lee on Trump: Bad dancer, 'not my president' MORE in November. 

The ad imagines an Election Day match-up between Trump and Clinton, showing doctored news footage reporting on Trump's election night concession to Clinton after an "unprecedented victory not since Reagan in 1984." 
 
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It also includes the voices of CNN newscaster Wolf Blitzer and MSNBC's Chris Matthews announcing the Democrat's victory. After footage of Clinton thanking an audience, from her kickoff address this summer, the footage rewinds before the warning viewers "Don't panic, it's not too late to change the future." 
 
"Vote Jeb," the spot ends. 
 
Bush has ramped up his criticism of Trump as he fights to reverse his slide in the polls over the past few months. He was the only candidate who directly criticized the GOP front-runner's call to ban Muslim's from entering the U.S. during this month's GOP debate. And many of his recent campaign ads focus on Trump.
 
Bush's best chance at toppling Trump is the upcoming primary election in New Hampshire, where he's locked in a logjam of establishment candidates. He is tied for fifth in RealClearPolitics' average of recent Granite State polls, but that's just 5 points out of second place.