Former Vice President Joe Biden went after President Trump as "literally an existential threat to America" in a speech in Iowa on Tuesday. Both Biden and Trump were in the state for dueling campaign stops in what could serve as a preview of a potential 2020 general election face-off. Biden first spoke at an Ottumwa rally, in which he argued that Trump being elected to another term would "fundamentally change who we are as a nation." Trump before heading to Iowa for his own events on Tuesday slammed Biden, calling him a "dummy" and "weak mentally" while suggesting he is a "different guy" and "slower than he used to be."

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