The businessman has been critical of using the device.
About 40 religious leaders are shunning Trump's speech at AIPAC Monday.
The final GOP debate is scheduled for next Monday in Salt Lake City.
Citizens for a Nuclear Free Iran is launching a nationwide campaign against the nuclear deal.
New poll finds many Americans have never heard of Israeli prime minister.
Sen. Rand Paul (R-Ky.) says AIPAC's supporters would back his legislation.
The letters were spearheaded by the American Israel Public Affairs Committee.
"There should not be a vote at this time on the measure," U.S.'s main pro-Israel lobby said.
She also suggests that Trump's speech be scheduled for 3 a.m.
All GOP candidates, along with Hillary Clinton, are scheduled to speak at the event.
Hillary Clinton, Paul Ryan and Benjamin Netanyahu are among the other speakers.
More than a dozen Jewish groups on both sides of the debate participated.
Obama may sit for interview to counter Israeli leader.
The White House has said a "zero enrichment" option is unrealistic.
House and Senate leaders will host a joint meeting with the Israeli leader on Monday.
A pro-Israel group on Friday denied a report that it had agreed to hold off on publicly pressing...