President Trump’s plan to let A.I. companies police themselves comes amid mounting examples that they are failing to put safeguards on the technology.

President Trump has been at the forefront of the “what-me-worry?” crowd, refusing to engage on how to balance the risks and rewards of A.I.

The U.S. has spent 20 years promising ‘crippling sanctions’ on Iran. But the latest effort comes with a reverse twist, after military action failed to accomplish President Trump’s goals.

The administration is veering wildly in its response to the national security implications of A.I. as China, America’s main technological and military rival, charges ahead.

A president who thought there were no limits to his power has discovered several, leaving him more frustrated and erratic.

A president who thought there were no limits to his power has discovered several, leaving him more frustrated and erratic.

In the end, the documentary evidence that President Trump claimed would prove his case appeared bound to disappoint those who expected bombshell revelations.

The F.B.I. director spent about eight hours at the White House Friday focused on the effort, which led to the subpoenaing of several Times reporters who wrote about the security of Air Force One.

As negotiations to end the war in Iran drag on, our reporter David E. Sanger describes the factors that are complicating any agreement.

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Danish soldiers sent to Arctic island in January were also given blood supplies in case of combat

Our national security reporter David E. Sanger describes how President Trump is considering a risky commando operation at an Iranian nuclear site.

President Trump’s plan for a settlement of Russia’s war in Ukraine, which alarmed the Ukrainians and Europeans, has evolved since it was first proposed last week. David Sanger, White House and nationa...