The guest list at Sen. John McCain's Arizona home next Monday includes at least three Republicans mentioned as vice presidential running mates, but a top aide said Wednesday that vetting possible veeps is not on the agenda. "It's purely social," said Mark Salter, a senior adviser to McCain, on Wednesday. He said Indian-born Louisiana Gov. Bobby Jindal, Florida Gov. Charlie Crist, former Massachusetts Gov. Mitt Romney and their wives were all invited to a Memorial Day gathering Monday at the senator's home in Sedona, Arizona. Romney ran for the Republican presidential nomination in last winter's primaries, but dropped out months ago and has endorsed McCain. Salter said 10 couples in all were invited, adding that McCain often hosts friends and political acquaintances at his compound.