U.S. President Donald Trump has told aides he has approved attack plans but is holding off to see if Iran will give up its nuclear program, the Wall Street Journal reported overnight.

He is due to receive an intelligence briefing on Thursday, a U.S. holiday, the White House said, while top U.S. diplomat Marco Rubio will meet his UK counterpart for talks expected to focus on the conflict.

President Donald Trump left the question of whether the United States will join Israeli strikes on Iran up in the air Wednesday, as he said that Tehran had reached out to seek negotiations.

"I may do it, I may not do it. I mean, nobody knows what I'm going to do," Trump told reporters as he supervised the installation of a new flagpole on the White House South Lawn.

As Israel pounds Iran with airstrikes targeting military facilities and its nuclear sites, officials in Tehran have proposed a variety of steps the Islamic Republic could take outside of launching retaliatory missile barrages.

Those proposals mirror those previously floated by Iran in confrontations with either Israel or the United States in the last few decades. They include disrupting maritime shipping through the Strait of Hormuz, potentially leaving the Nuclear Nonproliferation Treaty and attacks by allied militants.

If the U.S. decides to support Israel more directly in its attack on Iran, one option for Washington would be to provide the "bunker-buster" bombs believed necessary to significantly damage the Fordo nuclear fuel enrichment plant, built deeply into a mountain.

Such a bomb would have to be dropped from an American aircraft, which could have wide-ranging ramifications, including jeopardizing any chance of Iran engaging in Trump's desired talks on its nuclear program. Israeli officials have also suggested that there are other options for it to attack Fordo in central Iran as it seeks to destroy the country's nuclear capabilities.

Tulsi Gabbard left no doubt when she testified to Congress about Iran's nuclear program earlier this year.

The country was not building a nuclear weapon, the national intelligence director told lawmakers, and its supreme leader had not reauthorized the dormant program even though it had enriched uranium to higher levels.

Jeffrey Fields USC Dornsife College of Letters, Arts and Sciences

Relations between the United States and Iran have been fraught for decades – at least since the U.S. helped overthrow a democracy-minded prime minister, Mohammed Mossadegh, in August 1953. The U.S. then supported the long, repressive reign of the Shah of Iran, whose security services brutalized Iranian citizens for decades.

Six of the Group of Seven leaders discussed Russia's war in Ukraine and the Israel-Iran conflict but failed to reach major agreements on those and many other top issues — closing a summit that was forced to try and show how the wealthy nations' club might still shape global policy despite the early departure of U.S. President Donald Trump.

Canadian Prime Minister Mark Carney and his counterparts from the U.K., France, Germany, Italy and Japan were joined during Tuesday's final sessions by Ukrainian President Volodymyr Zelenskyy and NATO chief Mark Rutte.

Russian President Vladimir Putin is set to take questions Wednesday from international journalists on the sidelines of the St. Petersburg International Economic Forum.

Putin scheduled a roundtable session with senior news leaders of international news agencies, including The Associated Press. Among other issues, he's expected to spell out Moscow's position on the conflict between Israel and Iran that he offered to help mediate in a weekend call with U.S. President Donald Trump.

Russia poses a direct threat to the European Union through acts of sabotage and cyberattacks, but its massive military spending suggests that President Vladimir Putin also plans to use his armed forces elsewhere in the future, the EU's top diplomat warned on Wednesday.

"Russia is already a direct threat to the European Union," EU foreign policy chief Kaja Kallas said. She listed a series of Russian airspace violations, provocative military exercises, and attacks on energy grids, pipelines and undersea cables.

Iran’s ambassador in Geneva derided as “hostile” and “unwarranted” U.S. President Donald Trump’s comments calling for Iran’s “unconditional surrender.”

Ambassador Ali Bahreini told reporters the Israeli campaign “has not been able to bring big damage to our nuclear facilities” because it had taken precautions to protect them.