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Former New Hampshire Gov. John Sununu speaks during a meeting of the State Budget Crisis Task Force at the National Constitution Center in Philadelphia on June 25, 2013. | AP Photo Sununu joins anti-Trump effort

The latest addition to the anti-Donald Trump Our Principles super PAC: former New Hampshire Gov. John Sununu.

"Donors feel guilty they didn't get active earlier," Sununu told The Associated Press in a report published Wednesday afternoon, less than a day after Trump scored seven sweeping victories on Super Tuesday.

The major GOP establishment effort to keep Trump from earning the 1,237 delegates necessary to secure the nomination has taken on an added urgency in recent days, with Tim Miller, the former communications director for Jeb Bush's campaign, joining the super PAC on Tuesday.

"Frankly, at this point we want anyone but Trump," Sununu told the AP. "The goal is this: Let's get to the convention in Cleveland and figure it out there."

Our Principles PAC held a conference call with top GOP donors on Tuesday evening, POLITICO previously reported. Hewlett Packard President and CEO Meg Whitman, Chicago Cubs co-owner Todd Ricketts, and New York hedge fund manager Paul Singer were among those on the line.