Democratic presidential hopefuls Pete Buttigieg, left, former mayor of South Bend, Ind. and Minnesota Sen. Amy Klobuchar speak during the seventh Democratic primary debate of the 2020 presidential campaign season in Des Moines, Iowa on Tuesday.

Democratic presidential hopefuls Pete Buttigieg, left, former mayor of South Bend, Ind. and Minnesota Sen. Amy Klobuchar speak during the seventh Democratic primary debate of the 2020 presidential campaign season in Des Moines, Iowa on Tuesday.