Former Massachusetts Gov. Bill Weld announced on Friday that he's forming an exploratory committee ahead of a possible run against President Trump in 2020. In his announcement, Weld said that the country is in "grave peril" and that Trump is "unstable." He also said that Republicans who support the president "exhibit all the symptoms of Stockholm Syndrome." Weld was Libertarian candidate Gary Johnson's running mate during the 2016 election. Several Republicans have floated possible primary challenges against Trump, including former Ohio Governor John Kasich, though polls show that the majority of Republicans still back the president.

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