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NPR's Mary Louise Kelly introduces you to her new national security podcast, Sources & Methods. Each week digs into the biggest national security stories.

This week the federal government is to release new rules for how much water each of the seven states that share the Colorado River will get. Effects on the ecosystem were largely left unconsidered.

Trump's determination to find new legal justifications for his tariffs threatens to prolong the uncertainty facing the U.S. and global economies.

Fully self-driving cars for hire have been hailed as the technology of the future for years now. That future has finally arrived -- but only in some cities.

Monday is an important day on NASA's Artemis II mission. The crew is preparing for its lunar flyby and setting a record along the way: the farthest that humans have ventured in space.

Human rights experts commissioned by the U.N. say they have found "reasonable grounds" to believe the U.S. committed war crimes in Iran, including a strike on a school in the southern city of Minab.

President Trump loves to boast about his deal-making prowress. But so far in this term, he doesn't have much to show for it.

Canada's snap election has been dominated by one politician — who's not even in the race: President Trump.

Georgia is a key swing state — it carries a lot of electoral votes. Only seven states have more. The Harris and Trump campaigns see it as key to their path to the presidency.

NPR's Leila Fadel speaks with U.S. Rep. Greg Casar, D-Texas, about his efforts to regulate artificial intelligence.