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Hillary's nerves for Chelsea's wedding

US Secretary of State Hillary Clinton said daughter Chelsea's approaching wedding is making nervous wrecks of both her parents.

In an interview with NBC's Andrea Mitchell in Islamabad yesterday, Mrs Clinton was asked about former President Bill Clinton's role in the ceremony.

"You should assume that if he makes it down the aisle in one piece it's going to be a major accomplishment," Mrs Clinton said with a laugh.

"He is going to be so emotional, as am I."

Chelsea (30) plans to tie the knot with investment banker Marc Mezvinsky on July 31 in upstate New York.

Mrs Clinton stuck to her pledge not to reveal wedding details.

"My lips are sealed," she said, adding, "I am under very strict orders not to talk about it."

Asked what she saw as the significance of this being an interfaith union, Mrs Clinton said it says a lot about the couple's relationship. Ms Clinton is Christian; Mr Mezvinsky is Jewish.

"Over the years, so many of the barriers that prevented people from getting married, crossing lines of faith or colour or ethnicity have just disappeared," she said.

"Because what's important is: 'Are you making a responsible decision? Have you thought it through? Do you understand the consequences?' And I think in the world that we're in today we need more of that."