Jewish-American casino magnate Sheldon Adelson, who has been supporting Newt Ginrich's presidential campaign, has reportedly assured Mitt Romney even greater support should he become the Republican nominee in the upcoming U.S. elections.

Adelson, the world's 16th wealthiest person, and his wife Miriam donated $10 million last month to Winning our Future, the pro-Gingrich super PAC. Much of this was apparently used to fund an aggressive anti-Romney publicity campaign.

However, the New York Times published a report over the weekend saying several Adelson associates believe the billionaire would be willing to give even more support to Romney, should he emerge as the Republican nominee against U.S. President Barack Obama.

Adelson has been in personal touch with both candidates recently, meeting Gingrich at a get together of Gingrich supporters at the Venetian Hotel in Las Vegas, which Adelson owns.

Two weeks ago, Adelson held a telephone conversation with Romney, in which the two discussed, among other things, Romney's campaign messaging. Adelson associates described the conversation as "cordial."

Adelson is also known as a staunch supporter of Israeli Prime Minister Benjamin Netanyahu. He is the owner of the free, pro-Netanyahu daily Israel Hayom, which recently surpassed Yedioth Ahronoth to become Israel's most widely circulated newspaper.