President Trump declared the U.S. the "Guardian of the Hormuz Strait" on Monday, vowing the waterway would stay open "with or without Iran" and announcing a 20% toll on cargo for safe passage.
U.S. forces launched a new round of strikes against Iran as the standoff intensified, while Iran said the strait was closed "until further notice" and retaliated against U.S. bases and Gulf allies.
Oil prices surged about 9% to roughly $83 per barrel, and...
