Former New Hampshire Gov. John H. Sununu has joined an outside group that is rushing to raise millions of dollars to stop Donald Trump from becoming the Republican nominee.

Sununu and Meg Whitman, the chief executive officer of Hewlett Packard, are among the Republican leaders now with Our Principles. The super political action committee had limited fundraising success in earlier weeks, drawing almost all of its funding from the billionaire Ricketts family. The group has spent about $1.5 million on paid television and radio media, most of it ahead of Iowa's primary caucuses.

"Donors feel guilty they didn't get active earlier," Sununu tells The Associated Press.

The plan for Republicans who want to stop Trump is to deny him enough delegates to win the nomination outright, he says.

"Frankly, at this point we want anyone but Trump," Sununu says of who should become the nominee. "The goal is this: Let's get to the convention in Cleveland and figure it out there."