U.S. President Donald Trump warned that Iran had sent an official response to the U.S.-proposed end-of-war plan that was “completely unacceptable,” adding that he could launch additional strikes against Iran at any time. Iran, for its part, said it had “rejected the excessive demands of the United States” and vowed, “We will never bow our heads to the enemy.” With both sides convinced they hold the upper hand and refusing to step back even an inch, the plan by President Donald Trump to seal a...