(JTA) — U.S. Secretary of State John Kerry spoke by phone with Israeli Prime Minister Benjamin Netanyahu hours before the latter left for Washington.

The discussion on Saturday focused on the Iran nuclear talks with the world powers including the United States, Netanyahu’s visit to Washington and concerns over Israel’s punitive withholding of tax money collected for the Palestinian Authority, the New York Times reported on Sunday, citing unnamed American officials.

Netanyahu and Kerry reportedly speak frequently.

Netanyahu is scheduled to speak Tuesday before a joint session of Congress about concerns over the potential nuclear deal.

A framework agreement between Iran and the world powers is set to be signed at the end of the month.