Mitt Romney’s campaign is now targeting GOP rival Rick Santorum as a big-spending Washington insider. On a conference call Tuesday afternoon, former Missouri senator and Romney surrogate Jim Talent criticized Santorum’s support for expanding government spending, including his vote for the Medicare Part D in 2003—a program for which Talent himself voted.

“Senator Santorum is running in Missouri as a trusted and comprehensive conservative,” Talent said. “He certainly has been outspoken on social issues, and we honor his record in that regard, but when you get outside those issues into fiscal, spending, regulatory issues, his record shows that he’s been in the liberal wing of the Republican party.”