JERUSALEM — Mitt Romney’s high-dollar breakfast with donors at the King David Hotel here on Monday morning will be closed to the news media, his campaign decided Saturday, a change from the norm for the presumptive Republican presidential nominee.

The trip to Israel holds opportunity and peril for Mr. Romney, and his campaign aides have spent weeks preparing him for the fine diplomatic line he must walk while abroad. His relationship with Prime Minister Benjamin Netanyahu of Israel, which dates to their days as young consultants in Boston, is being scrutinized for signs of warmth or cooling, and everything said — and unsaid — will be carefully parsed.

The fund-raiser may be an especially delicate situation for Mr. Romney because of the attendance of Sheldon Adelson, a billionaire casino magnate who has pledged to spend some $100 million this election to help defeat President Obama, as well as elect Republicans. Though Mr. Adelson first supported Newt Gingrich during the early nominating contests because of his strong support for Israel, he has since thrown his support behind Mr. Romney. Mr. Adelson and his wife recently gave $5 million to a pro-Romney “super PAC.”

Mr. Romney seems to be taking pains to keep the fund-raiser under wraps. Typically, a small pool of reporters is allowed into fund-raisers held in public locations, in order to provide a written report on Mr. Romney’s remarks. Though there have been a few occasions when the campaign has tried to limit access — citing an especially small venue or the fact that Mr. Romney was not giving formal remarks — this is the first time that a public fund-raiser has been closed without any explanation.