President Obama's efforts to curb the spread of nuclear weapons threaten to expose and derail a 40-year-old secret U.S. agreement to shield Israel's nuclear weapons from international scrutiny, former and current U.S. and Israeli officials and nuclear specialists tell The Washington Times.

The issue will likely come to a head when Israeli Prime Minister Benjamin Netanyahu meets with Mr. Obama on May 18 in Washington. Mr. Netanyahu is expected to seek assurances from Mr. Obama that he will uphold the U.S. commitment and will not trade Israeli nuclear concessions for Iranian ones.

Assistant Secretary of State Rose Gottemoeller, speaking Tuesday at a U.N. meeting on the nuclear Non-Proliferation Treaty (NPT), said Israel should join the treaty, which would require Israel to declare and relinquish its nuclear arsenal.

"Universal adherence to the NPT itself, including by India, Israel, Pakistan and North Korea, ... remains a fundamental objective of the United States," Ms. Gottemoeller told the meeting, according to Reuters.

She declined to say, however, whether the Obama administration would press Israel to join the treaty.

A senior White House official said the administration considered the nuclear programs of Israel and Iran to be unrelated "apples and oranges."

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