Christie's team trying to figure out how fast a campaign could be mounted

At a fund-raising event in SoHo this year for New Jersey Republicans, with Mr. Christie as a host, Mr. Kissinger showed up. A person who was there quoted Mr. Kissinger as saying: “At my age, I have other things to do than to spend a Thursday night at a fund-raiser — but this guy is so important to the future of our country that I came here to tell you that you have to support him — and now I have to go.”

Mr. Kissinger was also among the guests at a meeting of dozens of top donors and other prominent Republicans convened by Ken Langone, the Home Depot founder. Mr. Kissinger surprised some of those there, according to a person briefed on the meeting, when he spoke up and urged Mr. Christie to run, saying that he would best represent United States interests abroad.

The pressure has also come during calls Mr. Christie has received or as he has bumped into influential Republican supporters, among them Mr. Murdoch, according to people close to both men who would discuss the subject only on the condition of anonymity.

In private conservations, several Republican governors have suggested that Mr. Christie consider running, as well…

“Sometimes the man can’t choose the moment,” one of the political operatives said. “That discussion has been part of the last 10 days.”