[cnn-photo-caption image= http://i.cdn.turner.com/cnn/2008/images/06/22/art.tomridge.gi.jpg caption="Former Homeland Security Secretary Tom Ridge."]
WASHINGTON (CNN) - Former Homeland Security Secretary Tom Ridge, appearing on 'Fox News Sunday,' said he wouldn't rule out being Sen. John McCain's vice president - if asked - but would have to first discuss a policy position that sets him apart from the Arizona senator: Abortion rights.
"If he asks me, we'll have a private conversation and we'll decide whether or not we ought to tell you what we said," Ridge said.
Host Chris Wallace pressed Ridge on his pro-abortion rights views - something critics say could hurt his chances of running with McCain, who has anti-abortion positions.
So would Ridge's views conflict with his support for a McCain administration? Apparently not.
"Obviously, the vice president's job is to support once a decision is made, whether it's on social issues, economic issues or diplomatic issues, the position of the president of the United States," he said.
"But that doesn't mean that you don't share a belief that you've had your entire life. But again, those are really difficult and challenging questions when the vice president and the president disagree on a wide range of issues, but the vice president's job is to support the administration."
Ridge, the former governor of Pennslyvania, could help McCain in the state, which is in play this year. As a moderately conservative Catholic, he could aid in other states with independent voters.
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But his position in favor of abortion rights could hurt McCain among the more conservative GOP base.
McCain voted for the Prohibit Partial Birth Abortion bill in 2003 and "yes" for Prohibiting Funds for Groups that Perform Abortions amendment in 2007. He also believes Roe v. Wade is a flawed decision that must be overturned, and supports the Supreme Court ruling upholding the Partial Birth Abortion Ban Act.
Ridge said Sunday, though, his own views will not change - vice presidency or not.
"I've had that point of view before I got into elected office. I've had it when I served, and I have it now ... we're not a one-issue party. Never have, never will be, although it's very important to our
base. And it's very, very important to Sen. McCain."
Former South Dakota Sen. Tom Daschle, appearing alongside Ridge, was also asked if he'd serve as Sen. Barack Obama's vice president.
Daschle quipped, "I'd say Tom Ridge would make a great V.P. candidate, Chris."
Wallace asked,"For Barack Obama?"
"No, no, no, for John McCain,"he said.
Daschle - an Obama supporter - reiterated that he is not seeking the vice presidency and hasn't talked to Obama about it.
"I don't expect to be asked. And I have no interest. .... I'm not looking for it."