WASHINGTON -- Tim Pawlenty, the former Minnesota governor who has become a top surrogate for presumptive Republican presidential nominee Mitt Romney, admitted on Sunday that he did go through the vice presidential vetting process, revealing he submitted "a bunch of tax returns" to the Romney campaign. In an interview with George Stephanopoulos on ABC's "This Week," however, Pawlenty refused to say how many years of returns he had to submit -- and whether he handed over more than the two years of tax returns that Romney himself has opened up to the public. "Well, I don't know the exact number, George, but I -- you know, there were several years, I believe," Pawlenty said. When Stephanopoulos further asked whether it was more than two years of returns, Pawlenty responded, "Well, we don't get into the details of the vetting process, but I gave them a bunch of tax returns.