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.

Israel's military said it was striking military targets in Tehran on Wednesday, as AFP journalists reported hearing blasts in the north and east of the Iranian capital.

The Israeli air force "is currently striking military targets belonging to the Iranian Regime in Tehran," the military said in a statement, on the sixth day of the war between the arch foes.

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.

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.

Iran's supreme leader Ayatollah Ali Khamenei said Wednesday the nation would never surrender as demanded by President Donald Trump and warned the United States it would face "irreparable damage" if it intervenes in support of its ally.

The speech came six days into the conflict, with Trump demanding Iran's "unconditional surrender" while boasting the United States could kill Khamenei and fueling speculation about a possible intervention.

The United States is setting up a round-the-clock task force to help Americans in the Middle East during the Israel-Iran conflict, officials said Tuesday.

U.S. President Donald Trump met his National Security Council on Tuesday to discuss the Iran-Israel war, the White House said, as the U.S. leader considered whether to join Israel's air campaign against Tehran.

Israel said it struck a nuclear site near Tehran on Wednesday, while Iran said it fired hypersonic missiles as the arch foes traded fire for a sixth day.

Hours after U.S. President Donald Trump demanded Iran's surrender, supreme leader Ayatollah Ali Khamenei vowed his country would show "no mercy" towards Israel's leadership.

U.S. President Donald Trump met with his national security team in the White House Situation Room on Tuesday to make decisions about U.S. policy towards the war between Israel and Iran, three U.S. officials told U.S. news portal Axios.

U.S. President Donald Trump dramatically stepped up his rhetoric against Iran's supreme leader Tuesday, saying on social media that the United States knows where Ayatollah Ali Khamenei is located but will not kill him "for now."

In another post, Trump also appeared to demand Iran's "UNCONDITIONAL SURRENDER!" as he fueled questions about whether the United States would join Israel's attacks on Tehran's leadership and nuclear facilities.