BOONE, Iowa (AP) — Donald Trump is saying good riddance to Rick Perry. Perry — a former Texas governor — is now out of the Republican presidential race. And Trump tells a crowd in Iowa, “He’s gone, good luck — he was very nasty to me.” Now the front-runner is taking aim at another 2016 rival, former neurosurgeon Ben Carson, who has risen high in national preference polls.

The billionaire businessman says he doesn’t think Carson “has the energy” to negotiate with world leaders. And Trump criticized Carson for comments that seemed to question Trump’s religious faith.