"Republicans should not be Ok with Donald Trump threatening to jail his opponent after the election," Flake said. "That is not who we are."

Republicans should not be okay with @realDonaldTrump threatening to jail his opponent after the election. That is not who we are.

— Jeff Flake (@JeffFlake) October 12, 2016

Flake has been an outspoken critic of Trump all election cycle. Flake, who is not up for re-election in November, has called out the Republican nominee for his comments against Muslims, Hispanics and women. Flake called on Trump to step aside over the weekend.