Anti-Trump super-PAC’s secret weapon: John McCain

“John McCain is very highly regarded by Republican primary voters, largely because he’s considered to be a war hero,” Packer said.

A McCain-focused attack ad, mail pieces and a newspaper advertisement running Sunday are being prepared by the super-PAC, Packer says.

Packer says her group had seen a surge in donor interest since spending at least $2,017,000 on TV, direct mail, digital, newspaper ads and phone calls against Trump in Iowa, where the billionaire underperformed in Monday night’s caucuses.

The super-PAC has already spent at least $566,000 against Trump in New Hampshire, according to Federal Election Commission records, but Packer indicated it will amplify the Granite State attacks in the coming days and go on to spend aggressively against Trump in South Carolina.