WASHINGTON (JTA) — President Donald Trump signed off on a U.S. policy of maintaining an ambiguous posture on Israel’s nuclear capability.

Trump soon after he assumed office signed a letter that has been standard since the Clinton administration and before that reflected a verbal policy going back to the Nixon administration, The New Yorker reported Monday.

Israel does not acknowledge its nuclear weapons capability and, under the agreement, neither does the United States. The agreement precludes U.S. pressure on Israel to divest itself of its nuclear weapons capability. In exchange, Israel agrees not to test or threaten to use its nuclear weapons.

A number of non-Israeli experts have determined that Israel has the capability to arm 200 missiles with nuclear warheads. Israel is not a signatory to the nuclear nonproliferation treaty.