Prime Minister Benjamin Netanyahu defended on Sunday a planned speech to the U.S. Congress about Iran, saying he had a moral obligation to speak out on an issue that poses a mortal threat to Israel.

His visit to Washington in March has opened up a rift with the White House and has drawn accusations in Israel that Netanyahu is undermining the country¡¯s core foreign alliance in an effort to win an election due two weeks after the trip.

Briefing his Cabinet on the March 3 speech to a joint meeting of Congress, Netanyahu said his priority was to urge the United States and other powers not to negotiate an Iranian nuclear deal that might endanger Israel.