An assertive bipartisan get-out-the-vote effort known as “IVoteIsrael” and aimed at Americans living in that country appears to have ties to conservative billionaire Ronald S. Lauder, a supporter of Republican causes and of the hawkish Israeli Prime Minister Benjamin Netanyahu.

A project of Americans for Jerusalem, a charity registered under 501(c)4 of the U.S. tax code, IVoteIsrael is not required to release information about its donors. However, corporate filings in Delaware show that the group lists the same Manhattan address as that used by the Ronald S. Lauder Foundation. Other intriguing connections:

• Allen Roth, the president of ...