WASHINGTON — President Donald Trump on Thursday capped a three-year drive to roll back clean air and water protections by proposing stark changes to the nation’s oldest and most established environmental law that could exempt major infrastructure projects from environmental review.

The revisions to the law — the 50-year-old National Environmental Policy Act, a landmark measure that touches nearly every highway, bridge, pipeline and other major federal construction in the country — underscored Trump’s focus on stripping away regulations, to the consternation of conservationists. In the middle of a foreign-policy crisis and on the cusp of an impeachment trial in the Senate, Trump appeared in his element Thursday, flanked by men in hard hats and orange safety vests.

“America’s most critical infrastructure projects have been tied up and bogged down by an outrageously slow and burdensome federal approval process, and I’ve been talking about it for a long time,” he said.

Trump, who made his fortune as a real estate developer, spoke as if personally aggrieved: “The builders are not happy. Nobody’s happy.”

Since taking office Trump has proposed nearly 100 environmental rollbacks, including weakening protections for endangered species, relaxing rules that limit emissions from coal plants and blocking the phaseout of older incandescent light bulbs. Hundreds of thousands of public comments against the president’s moves have flowed in. Scientists have spoken out in opposition. Democrats have vowed to stop him, all with little effect.

“He sees himself as the kingpin of an anti-federal-regulatory movement,” said Douglas Brinkley, a presidential historian at Rice University who has written about environmental policy.

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But haste and zeal may work against administration. Nearly 70 lawsuits have been filed to challenge the administration’s deregulatory moves, asserting that officials have violated federal procedures in their rollback efforts. The Trump administration has, so far, been successful just four times, according to New York University School of Law data.

Some of Trump’s moves have been never been tried before, such as the reversal of national monument designations by his predecessors. Some have been remarkably defiant, like Thursday’s effort to alter a half-century-old law by decree, carving out a new category of infrastructure projects not subject to environmental review.

The interior secretary, David Bernhardt, who has overseen plans to weaken limits on the release of methane, a potent greenhouse gas, and loosen offshore drilling safety rules, called the proposed changes to the National Environmental Policy Act the Trump administration’s most significant deregulatory proposal yet.

Critics agreed. James A. Thurber, a political-science professor at American University, described Trump’s latest actions to “altering the Ten Commandments of environmental policy.”

All told, Trump has gone further than any other president, including Ronald Reagan, in dismantling clean air and water protections. The National Environmental Protection Act was signed into law by Richard Nixon after calls for greater oversight when the heavily polluted Cuyahoga River in Ohio caught fire and a tanker spilled 3 million gallons of crude off the coast of Santa Barbara, California, in 1969.

“No other president has had the gall to try to back polluters and turn back the clock to pre-Santa Barbara,” Brinkley said. “Nothing compares to what Donald Trump is doing.”

“No other president has had the gall to try to back polluters and turn back the clock to pre-Santa Barbara. Nothing compares to what Donald Trump is doing.” — Douglas Brinkley

But Trump’s moves also have won wide praise — not just from the oil and gas industry but also from labor unions that Trump is eager to win over in November. In 2016, union members, who had traditionally voted for Democrats, helped Trump win the White House.

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Under the National Environmental Policy Act, major federal projects like bridges, highways, pipelines or power plants that will have a significant effect on the environment require a review, or environmental impact statement, outlining potential consequences.

The proposed new rules would change the regulations that guide the implementation of the law in a number of ways, including by narrowing the range of projects that require such an assessment and by imposing strict new deadlines on completing the studies.

The changes would also eliminate the need for agencies to consider the “cumulative impacts” of projects. In recent years, courts have said that includes studying the planet-warming consequences of emitting more greenhouse gases. Mary B. Neumayr, chairwoman of the White House Council on Environmental Quality, said the change did not prevent or exclude consideration of the effect of greenhouse gases; consideration would no longer be required.

And the changes would set hard deadlines of one year to complete reviews of smaller projects and two years to complete reviews of larger ones.

“Today it can take more than 10 years to build just a very simple road,” Trump said. “And, usually, you’re not able to even get the permit.”

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Bernhardt said he had seen environmental studies that prevented the timely construction of schools on tribal lands and visitor centers at national parks, and hindered the ability of farmers to secure water supplies.

Nancy Pelosi, the House speaker, saw it differently. “This means more polluters will be right there next to the water supply of our children,” she said. “That’s a public health issue.”

The changes were expected to appear in the federal register Friday. There will be a 60-day window for public comment and two public hearings before a final regulation is issued, most likely in the fall.

Richard L. Revesz, a professor of environmental law at New York University, said he did not believe the changes would hold up in court. The National Environmental Policy Act requires that all the environmental consequences of a project be taken into account, he said, and that core requirement cannot be changed by fiat.

“A regulation can’t change the requirements of a statute as interpreted by the courts,” Revesz said. In fact, he argued, under the Trump administration’s guidance, federal agencies are more likely to be sued for inadequate reviews, “leading to far longer delays than if they had done a proper analysis in the first place.”

The proposed regulation does not set a dollar threshold for what constitutes a large federal footprint, a factor that one official said could also allow major mining, drilling and other projects to avoid environmental assessments.

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Rep. Rob Bishop of Utah, the ranking Republican on the House Natural Resources Committee, said he believed the changes would bring “rationality” to federal bureaucracy.

“There has been nothing more detrimental to the development of transportation, clean water, and energy infrastructure than America’s broken environmental review and permitting process,” he said.

“This one hits home for me.” — William K. Reilly, administrator of the EPA under President George Bush, who wrote the first regulations for environmental impact statements in 1970.

Environmental groups said the revisions to the act would threaten species and lead to more greenhouse gases in the atmosphere. The proposal does not mention the words “climate change,” but courts have interpreted the requirement to consider “cumulative consequences” as a mandate to study the effects of allowing more planet-warming greenhouse gas emissions into the atmosphere. It also has meant understanding the effects of rising sea levels and other results of climate change on a given project.

That means agencies will not have to examine whether a pipeline, mine or other fossil fuel project would worsen climate change. It also means there will not be any requirement to understand how or whether a road or bridge in a coastal area would be threatened by sea-level rise.

William K. Reilly, administrator of the Environmental Protection Agency under President George Bush, said of the changes, “This one hits home for me.” He wrote the first regulations for environmental impact statements as a White House aide in 1970.

The National Environmental Policy Act, he said, has been “very important” in preventing environmental harm on major infrastructure projects. He particularly took issue with Trump’s remarks Thursday that other countries “look at the United States and they can’t believe” the restrictions on development.

“It has been a model,” Reilly said of the law. “It’s one of those things that other countries around the world have copied and admired.”