The Biden-era limits were designed to reduce emissions of toxic pollutants, including a cancer-causing ingredient used in antifreeze and plastics.

© Mark Felix for The New York Times

The agency head said a $20 billion Biden climate program was marred by fraud and abuse. A judge said on Wednesday the E.P.A. hasn’t provided evidence.

© Kenny Holston/The New York Times

The president wants to weaken limits on tailpipe pollution. Scientists say it’s driving climate change and taking human lives “every day.”

© Graham Dickie/The New York Times

In his first few weeks, President Trump has frozen climate spending, shaken up staffing at agencies like the E.P.A. and set off a wave of legal challenges.

About 80 percent of manufacturing investments spurred by a Biden-era climate law have flowed to Republican districts. Efforts to stop federal payments are already causing pain.

Dozens of suits have been filed that seek to stop some of President Trump’s executive orders. Here’s a brief rundown.

Some have halted work on the Biden-era $5 billion program to build E.V. charging stations. Others plan to keep building. Most are confused.

Recklessness will not get us to a revitalized government, but neither will excessive caution and addiction to procedure.

Even aside from his stunning Gaza proposal, President Trump gave Prime Minister Benjamin Netanyahu of Israel nearly everything he wanted, signaling a renewal of their close alliance.

In a briefing that recalled his most extreme first term remarks, President Trump said without any evidence that diversity initiatives caused the midair collision.

Under three minutes of questioning from Senator Peter Welch, a Vermont Democrat, Kash Patel conceded only that Joe Biden was “certified” as the president.

Early in his first administration, President Trump noted the general’s “brilliance and fortitude.” And then the president got angry.

Executive orders and announcements by President Trump have put billions of dollars in U.S. climate commitments into question.

The messages showed that F.B.I. investigators took normal bureaucratic steps and precautions when opening an extraordinarily sensitive inquiry into Mr. Trump’s attempts to overturn the 2020 election.

Gross domestic product grew by 2.3 percent in the fourth quarter, capping a more robust year than expected. Policy uncertainty clouds the outlook.

Legislation that goes into effect on Thursday bars UNRWA from operating in the country. That will affect aid delivery to Gaza and beyond.

Oil and gas executives welcomed President Trump’s early moves on energy policy, but many said they did not plan to increase production unless prices rose significantly.

Even more than in his first term, President Trump has mounted a fundamental challenge to the norms and expectations of what a president can and should do.

The South Carolina Republican told CNN that he “did not like” how Trump pardoned people who “beat up cops,” and suggested he would be open to curtailing the presidential pardon power.

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.