Donald Trump has spent much of the early days of his presidential campaign taking on Jeb Bush.

But in Iowa on Saturday, the real estate mogul took shots at Scott Walker, who’s long stood atop polls in the Hawkeye State, home to the critical first-in-the-nation caucuses.

Trump — who is in second place in Iowa polls behind Walker — slammed the Wisconsin governor’s leadership.

“Wisconsin is doing terribly. It’s in turmoil,” Trump said at Oskaloosa High School in Oskaloosa. “The roads are a disaster because they don’t have money to rebuild them.”

He also accused Walker’s administration of borrowing due to a budget deficit, and painted him as a supporter of Common Core education standards, which are opposed by much of the Republican base.