Iran live updates: US blockade of Iran's Strait of Hormuz ports to begin Monday

The U.S. carried out strikes against approximately 50 military targets on Kharg Island on Tuesday that had previously been struck last month, according to a U.S. official.

In mid-March, the U.S. struck 90 military targets on the island, which is Iran's oil transportation hub. Those 90 targets were described then as including storage bunkers for naval lines and missiles, and other military infrastructure.

The island itself is roughly the same size as Key West, Florida, or a third the size of the island of Manhattan.

When asked by reporters if he expected Iran to come to the negotiating table, Secretary of State Marco Rubio said "hope we have more news later today on that."

"The whole world's been impacted, unfortunately, because Iran is violating every law known by striking commercial vessels in the Strait of Hormuz, and it's a big problem for the world," he said.

The White House is responding to reports that Iranian officials have reportedly stopped negotiations with the U.S. ahead of President Donald Trump's 8:00 p.m. deadline, telling ABC News that the "only the president knows where things stand."

"The Iranian regime has until 8 p.m. Eastern Time to meet the moment and make a deal with the United States. Only the President knows where things stand and what he will do," White House press secretary Karoline Leavitt said in a statement.

President Donald Trump told Fox News on Tuesday that the strikes on Iran that he promised would begin at 8:00 p.m. Tuesday are "happening," but cautioned that things "could change."

Trump's comments come just hours after the president said "a whole civilization will die tonight never to be brought back again" if a deal was not reached between the U.S. and Iran.

Trump told Fox News that if negotiations were successful then plans for strikes could change, but confirmed that the U.S. was preparing for his deadline.