US President Donald Trump formally notified Congress that "military action" against Iran restarted last week, according to a letter obtained by CBS News on Monday, as a monthslong ceasefire comes to an end.

Axar.az informs, citing CBS News, Military action "commenced on July 7," the president said in a message dated July 10 and addressed to Republican Sen. Chuck Grassley of Iowa, the Senate's president pro tempore.

The letter was sent after Mr. Trump declared the U.S.-Iran ceasefire "over" and ordered several rounds of strikes on Iranian targets, in response to Iranian attacks on commercial vessels in the Strait of Hormuz last week. Iranian authorities have insisted that ships seek permission and use an Iranian-approved route before transiting the strait, and responded to the U.S. strikes by launching missiles and drones at U.S.-allied Gulf states.

The notification to Congress calls the most recent strikes "limited, measured, planned, and executed in a manner designed to minimize civilian casualties." The goal, Mr. Trump wrote, is to target Iranian military sites that pose a threat to U.S. forces and commercial shipping.

Under the War Powers Resolution of 1973, a post-Vietnam War law, the president must notify Congress within 48 hours of the start of military hostilities. Shortly after the U.S.-Iran war began in late February, the White House sent a notification to Congress, but the Trump administration's position was that hostilities had "terminated" after the two sides signed a ceasefire in early April.