With the change, the Trump administration has also backed away from a signature effort to stay ahead of China in the A.I.

President Donald Trump’s nominee for U.S. ambassador to the United Nations is facing questioning from lawmakers for the first time since he was ousted as national security adviser ...

President Donald Trump's nominee for U.S. ambassador to the United Nations will face questioning from lawmakers for the first ...

President Donald Trump’s nominee for U.S. ambassador to the United Nations is facing questioning from lawmakers for the first time since he was ousted as national security adviser ...

President Donald Trump and Sen. David McCormick of Pennsylvania jointly announced tens of billions of dollars of energy and ...

MICHAEL KIMMAGE is Professor of History at the Catholic University of America. He is the author of Collisions: The Origins of the War in Ukraine and the New Global Instability.

The Kremlin said on Tuesday that U.S. President Donald Trump's recent statements, including a threat of sanctions on buyers ...

Back-channel contacts, direct diplomacy and a multibillion-dollar weapons deal helped align the U.S. and Europe on arming Ukraine.

Pentagon officials said details were still being worked out, and experts doubted Mr. Trump’s threat of huge tariffs for ...