Jeb Bush is going after the top three finishers in Monday night's Iowa caucuses in New Hampshire.
He says Ted Cruz, Donald Trump and Marco Rubio are "untested" and do not have the experience to handle the Oval Office job.
He was especially critical of Trump, saying the billionaire businessman "disparages" and "insults" people during the campaign because he's "a man with deep insecurities."
Bush made his comments at New England College in Henniker, N.H., one of four events in the state that holds the nation's first primary Feb. 9.
He was especially critical of Trump, saying the billionaire businessman is "a man with deep insecurities."