WASHINGTON — President Donald Trump said Sunday the U.S.-led military operation against Iran could last "four weeks or less," describing it as a planned, time-limited campaign even as strikes escalated into a third day and Iranian retaliatory attacks spread to Israel, Gulf states and U.S. assets, killing American troops and prompting fears of a broader regional war.

In multiple interviews and statements over the weekend, Trump outlined a four-week timeline for achieving U.S. objectives, which he has not fully detailed but appear to include degrading Iran's military capabilities, nuclear infrastructure and leadership following the killing of Supreme Leader Ayatollah Ali Khamenei in the opening salvos Saturday.