Washington (CNN) -- Nevada casino magnate Sheldon Adelson is considering attending a fundraiser Mitt Romney's campaign is hosting in Israel, a source with knowledge of the event confirmed to CNN.

Adelson, who is a major backer of Israel and has a home there, is now supporting Romney's campaign and has pledged to help get him elected. Last month he and his wife gave $10 million to the super PAC backing Romney, Restore Our Future.

One of the major donors to Republican causes, Adelson has pledged to give as much as $100 million to support various GOP efforts this election cycle, sources have previously said. Adelson, along with his wife, donated $20 million to the super PAC that supported Newt Gingrich's campaign, Winning Our Future.

Guaranteeing Israel's well-being is one of Adelson's major priorities and motivations for his political activities, friends and associates have said.

The Romney fundraiser in Israel is going to be a breakfast and is being held at the historic King David Hotel next Monday, July 30. Adelson's possible attendance was first reported by ABC News.

Since U.S. citizens only can donate to presidential campaigns, those attending the event either will be Americans who are visiting the country or those who are now living there. Some of the campaign's major Jewish donors will be attending the fundraiser. Those attending are being asked to either donate $50,000 per couple or raise $100,000 for the campaign.

Romney is expected to arrive in Israel Saturday night after his stop in London.

The source who confirmed Adelson's possible attendance asked for his name not to be used because the event is private.

Representatives of Adelson did not return calls seeking comment.

One of the groups Adelson is involved in is the Republican Jewish Coalition, where he serves on its Board of Directors. As part of an effort to attract more Jewish support for Romney, the group Thursday announced they will soon launch a $6.5 million multi-pronged campaign titled "Buyer's Remorse," showcasing voters who previously supported the President Obama but say this year will now not vote for him.

A major part of this effort will be television ads featuring some of those voters that will start airing in mid-September through the election, RJC Executive Director Matt Brooks told CNN. The group has reserved substantial air time in Florida, Ohio and Pennsylvania although those targets could change depending on the electoral landscape there and in other states. It will also use social media, web ads and grassroots outreach.

Adelson is one of 60 RJC board members, but they did not have a role in directing the project, Brooks said, in order to prevent them from having any conflicts of interest they may have with other political projects. Brooks told CNN most of the $6.5 million for the initiative has been raised, but he declined to say whether Adelson, who has been a board member for over a decade, was one of the contributors. "He is passionate about the organization," Brooks said.

This will be a large hurdle for Republicans. Obama won 78% of the Jewish vote in 2008, according to CNN's exit poll.