WASHINGTON, June 11 (Reuters) - U.S. President Donald Trump on Thursday said he believed Iran's Supreme Leader Mojtaba Khamenei had approved a deal with the U.S. that would trigger the opening of the Strait of Hormuz and the lifting of a U.S. blockade on Iranian ports.

When asked by a reporter at the White House whether Khamenei had approved the deal, Trump said: "I understand the answer is yes."

Trump described the deal as "a very strong memorandum of understanding," adding it was "a little conceptual, but it's something that's going to get done".

(Reporting by Humeyra Pamuk and Ryan Patrick Jones;Editing by David Ljunggren)