Rick Santorum, who will formally announce his candidacy later today in Pennsylvania, said this morning “We are going to be in this race and we’re in it to win.”

Santorum, who lost his senate seat in 2006 by 18 percentage point, told Good Morning America that he had lost because of his principled stands, including discussing reforming Social Security. Santorum pointed out that “not even Paul Ryan and his budget” had attempted to tackle Social Security.

Santorum hopes people will say that he “’may have lost, but he didn’t flinch. He stood by what he believed in.’”

He also criticized President Obama’s foreign policy actions, calling Obama a “paper tiger” for his “appeasing” of Iran.

Full interview: