U.S. and Iranian negotiators have agreed to extend the ceasefire for two months and begin substantive negotiations on the future of Iran’s nuclear program, but President Donald Trump is still mulling the final agreement.

The agreement, officially a memorandum of understanding, comes as Trump’s negotiating team has raced to close the gap between Washington, D.C., and Tehran, even as light fighting in and around the Strait of Hormuz continues, including two separate incidents in the past two days.