Trump told the Wall Street Journal that he knew all about Israel’s plan ahead of time, that he wasn’t given a mere “heads-up.”

Iran's top diplomat Abbas Araghchi said Saturday that Israel's strikes on his country were undermining nuclear talks with the United States. Araghchi, in a call with Russia's Foreign Minister Sergei Lavrov,

Follow live updates as Iran retaliates after Israel strikes nuclear facilities. Stay informed with real-time news and developments.

The United States is the main international backer of Israel, Iran's biggest regional foe. It is also a close ally of Sunni Gulf monarchies which for years pursued their own rivalry with the Islamic Republic, seeing it as their main regional threat.

Iran and Israel exchanged more deadly missile strikes overnight Friday after Israel mainly attacked Iranian nuclear and military targets one day earlier.

Israel on Saturday threatened to strike "every target of the ayatollah regime" in Iran, whose president warned of a severe response if the Israeli attacks continue, fuelling fears of an escalating conflict.

Israeli Prime Minister Benjamin Netanyahu on Saturday vowed intensified strikes on Iran, declaring that "what they have felt so far is nothing compared with what they will be handed in the coming days",

Iranian officials have repeatedly denied seeking a nuclear weapon. The United States and Iran have held five rounds of negotiations toward achieving an agreement that would limit Iran's nuclear activities in exchange for sanctions relief, with a sixth round of talks scheduled for Sunday.

The U.S. did not provide any assistance or have any involvement in the Israeli strike, a U.S. official told ABC News. ABC News' Chief Washington Correspondent Jonathan Karl spoke to President Donald Trump on the phone early Friday morning and asked him about the attack on Iran.

The United States has pulled some diplomatic staff and military families out of the Middle East, citing unspecified regional security risks.

Interviews with half a dozen senior Iranian officials show that they were not expecting Israel to strike before another round of talks.