President Trump on Wednesday autographed the US-Iran memorandum of understanding — after witnessing Vice President JD Vance electronically sign the document to end the war on Sunday, a senior US official told The Post. “On Sunday, the MOU was signed digitally by Vice President Vance and [Iranian Parliament] Speaker [Mohammad-Bagher] Ghalibaf and witnessed by President Trump,” the person said. “Now, it has been signed by President Trump and President Pezeshkian.” US officials had previously said that Trump also electronically signed the document on Sunday.