By Patricia Zengerle

WASHINGTON, June 16 (Reuters) - President Donald Trump said on Tuesday he was willing to send his interim deal to end the war with Iran for review by the U.S. Congress, as lawmakers, including many of his fellow Republicans, said they were largely in the dark about the pact.

The U.S.-Iran agreement, announced on Sunday, has spurred optimism that a conflict that has killed thousands and disrupted the global economy will soon end.

According to officials from both countries, the memorandum of understanding would extend a tenuous ceasefire announced in April by another 60 days and reopen the Strait of Hormuz, a major shipping route effectively blocked since the U.S. and Israel began attacking Iran on February 28.

But the details remain unclear and the text of the pact has not been released or sent to Congress.