The Koch brothers have been not-so-slowly buying up American politics. Senator Bernie Sanders issued a warning that those two brothers are closing in on their goal of having more political power than either the Republicans or Democrats.

The warning came last week while Sanders spoke to a group of supporters in Iowa.

“It is likely in a very short period of time that the Koch brothers themselves will have a stronger political presence than either the Democratic or the Republican Party,” said Sanders. Drawing out why he is the right candidate for working class Americans, he pointed out that he is “prepared to take on the billionaire class.”