After helping President Trump get elected, Elon Musk was poised to dominate the country’s A.I. policies. Then Mr. Altman sneaked into the White House.

Other big technology companies have been boisterous in their courtship of the new administration. But Nvidia and Microsoft have avoided the Washington spotlight.

As Mark Zuckerberg and other tech titans have embraced President Trump and muffled internal dissent at their companies, their mostly left-leaning employees have objected with subtle acts of defiance.

President Trump jabs at the Russian leader with threats; Vladimir Putin responds with flattery. But there are notable signals in their jousting, including a revived discussion about nuclear arms control.

Our columnist suggests how to think about stocks and bonds during a presidency that is signaling a deep devotion to profits.

The full-scale assault by the conservative movement on liberal domination of the nation’s culture has begun to deliver key victories.

President Vladimir V. Putin of Russia praised President Trump’s second inauguration, but the American leader did not return the compliment.

President Trump made major policy moves immediately after taking office, withdrawing from major international agreements, promising steep tariffs and pardoning nearly all of the Jan. 6 rioters.

On his first day back in office, President Trump pardoned all of the nearly 1,600 people charged in connection with the attack on the Capitol on Jan. 6, 2021. Maggie Haberman, White House correspondent for The New York Times, describes what’s behind those pardons.

We’ll be regularly checking in with this group of people during President Trump’s first 100 days in office. Here’s what they thought on Day 1.

In his Inaugural Address and remarks afterwards, President Trump repeated inaccurate talking points about the economy, immigration, world affairs and the prosecutions into his own conduct. Linda Qiu checked the facts.

The Inaugural Address that President Trump gave on Monday was in some ways even darker than his “American carnage” inaugural address eight years ago. Michael D. Shear, a White House correspondent for The New York Times, explains.

Dozens of people with ties to the Jan. 6, 2021, attack on the Capitol gathered outside the detention facility in Washington to celebrate Trump’s pardons of those convicted of crimes that day.

President Trump’s pardons in the Jan. 6 case abruptly ended the most complex investigation in U.S. history. It also raised questions about what he will do next against a department he has said is full of his enemies.

There were Proud Boys, billionaires, stiletto heels, cowboy hats, Village People, icy cold and happy Canadians at President Trump’s inaugural.

The Florida governor used the wording in issuing a state of emergency over a cold snap expected in his state.

Donald Trump’s pledge-filled speech made him sound like a candidate trying to run up the score.

Wiser about the use of power, the newly sworn-in president suggests that this time he will not take no for an answer, whether in enacting an ambitious domestic agenda or in his expansionist worldview.

The tradition of swearing the oath of office on a Bible stretches back to George Washington, but not all presidents have observed it.

The returning first lady and Barron Trump, the son she had once shielded from the public eye, used Monday’s inauguration to reintroduce themselves.