The Trump administration offered a 15-point ceasefire plan to Iran, the Associated Press reported citing a person briefed on the contours of the proposal, even as the U.S. military prepared to send at least 1,000 more troops to supplement some 50,000 troops already in the Mideast.

The plan was submitted to Iran by intermediaries from Pakistan, who have offered to host renewed negotiations between Washington and Tehran, according to the person, who spoke on condition of anonymity because they were not authorized to speak publicly.

The New York Times was the first to report that the plan had been delivered to Iranian officials.

The Pentagon is also in the process of deploying two Marine units that will add about 5,000 Marines and thousands of sailors to the region, according to AP.

The moves are being framed as Trump maneuvering to give himself “max flexibility” on what he will do next, AP reported citing its source.

Israeli officials, who have been advocating for President Donald Trump to continue the war against Iran, were surprised by the submission of a ceasefire plan, the person said.

Earlier in the day, Trump said the U.S. was in talks with Iran to end the war as diplomatic efforts picked up and Iran issued a newly defiant statement. Meanwhile, airstrikes battered the Islamic Republic while Iranian missiles and drones targeted Israel and sites across the region.

The U.S. and Israel launched what they described as a pre-emptive strike against Iran on February 28, claiming that Tehran was developing a nuclear weapon and posed a threat—an allegation Iran has denied. In response, Iran launched counterattacks, firing missiles and drones at Israel, as well as at U.S. assets and other targets across the Middle East.