US President Barack Obama speaks during an interview with Reuters in the Library of the White House in Washington March 2, 2015. [Photo/Agencies]

EASING TENSIONS

Obama also sought to lower the temperature by describing Netanyahu's planned speech to Congress as a distraction that would not be "permanently destructive" to US-Israeli ties and by saying the rift was not personal.

Obama refused to meet Netanyahu during the visit, on the grounds that doing so could be seen as interference on the cusp of Israel's March 17 elections when the prime minister is seeking re-election against a tough center-left challenger. On Monday, the president said he would be willing to meet Netanyahu if the Israeli leader wins re-election.

But he said Netanyahu's US visit gave the impression of "politicizing" the two countries' normally close partnership and of going outside the normal channels of US foreign policy in which the president holds greatest sway. Netanyahu's planned speech has driven a wedge between Israel and congressional Democrats. Forty two of them plan to boycott the address, according to The Hill, a political newspaper.

Netanyahu, who was given rousing bipartisan welcomes in his two previous addresses to Congress, is expected to press US lawmakers to block a deal with Iran that he contends would endanger Israel's existence but which Obama's aides believe could be a signature foreign policy achievement.

The invitation to Netanyahu was orchestrated by Republican congressional leaders with the Israeli ambassador without advance word to the White House, a breach of protocol that infuriated the Obama administration and the president's fellow Democrats.

The partisan nature of this dispute has turned it into the worst rift in decades between the United States and Israel, which normally navigates carefully between Republicans and Democrats in Washington.

Netanyahu wants Iran to be completely barred from enriching uranium, which puts him at odds with Obama's view that a deal should allow Tehran to engage in limited enrichment for peaceful purposes but under close international inspection.

Obama said a final deal must create a one-year "breakout period" for Iran, which means it would take at least a year for Tehran to get a nuclear weapon if it decides to develop one, thereby giving time for military action to prevent it.

Netanyahu has said such a deal would allow Iran to become a "threshold" nuclear weapons state, that it would inevitably cheat on any agreement and that the lifting of nuclear restrictions in as little of 10 years would be an untenable risk to Israel. He has hinted at the prospect for Israeli military strikes on Iranian nuclear facilities as a last resort, though he made no such threat in his AIPAC speech on Monday.