But some say these ties, which include a previously undisclosed real estate deal in New Jersey with a major Israeli insurer, may give Kushner a surprising advantage as he is expected to launch the first peace talks of the Trump era.
Having the trust of Israeli Prime Minister Benjamin Netanyahu, the thinking goes, could make Kushner well positioned to extract concessions from the hard-line Israeli leader.
These relationships, along with a personal friendship with Netanyahu and past links to the West Bank settler movement, could emerge as potential stumbling blocks by creating an appearance of bias.
Harel Insurance Investments & Financial Services Ltd. confirmed that it shares ownership and profits on a New Jersey apartment building with the Kushner Companies.
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Harel informed The Associated Press of the joint investment and said it had not previously announced it publicly.
In addition, the Kushner Companies confirmed longstanding relationships with two major Israeli banks that have been investigated by U.S. Authorities for allegedly helping wealthy clients evade U.S. Taxes.
Jared Kushner headed the billion-dollar family firm before joining the White House as a senior adviser in January.
As a condition to taking the job, Kushner has agreed to file a financial disclosure report and divest some holdings that could create a conflict of interest.
The Trump administration has faced repeated conflict of interest accusations since taking office.
Although the billionaire real estate magnate says he's no longer managing his global financial interests, critics say these businesses still stand to profit from the prestige or policy decisions of the presidency.
While Kushner's role in Mideast diplomacy remains unclear, Trump has said his son-in-law will work to "broker a Middle East peace deal.