Many of America’s leading artificial intelligence executives spent the weekend warning about the technology’s risks to humanity and urging for a global slowdown in A.I. development. But President Trump doesn’t agree. So he called Nvidia’s chief executive during an event today in Los Angeles and spoke to the crowd over speaker phone.

“It’s a hoax,” the president told Jensen Huang, who held a microphone next to his phone. “The robots are not going to be taking over the world. That’s not going to happen.” On social media, Trump made clear that he opposes calls to place new limits on A.I. — after some researchers argued that the technology could lead to mass unemployment, biological weapons and autonomous warfare. “The only control or ‘guardrails’ that AI needs is a STRONG AND SMART (High IQ!) PRESIDENT,” the president said. Top lawmakers in both parties suggested this weekend that Congress should place new guardrails. But there has been little movement so far, and Trump has argued that imposing additional restrictions on American companies would allow Beijing to “win” the A.I. race.

E.P.A. erases limits on climate pollution from power plants The Trump administration announced today that the federal government will no longer limit the planet-warming pollution that power plants create by burning coal and gas. The agency plans to argue that greenhouse gases from power plants do not endanger human health or the environment, and that it therefore lacks the authority to regulate them. The move is expected to be challenged in court. If it survives, the shift would effectively complete Trump’s erasure of the most consequential climate policies of his Democratic predecessors. It could also prevent future presidents from regulating greenhouse gas emissions from power plants.

Another judge deals a blow to Trump’s mail-in ballot plan A Trump-appointed judge in Washington, D.C., ruled late last night that the president’s plan to significantly change the mail-in balloting process ahead of the November elections is most likely illegal and should be blocked. The judge said the administration had not presented evidence showing that it would lead to widespread fraud. Voting officials around the country are awaiting a decision from the Supreme Court on a similar ruling by a different federal judge, who found that Trump’s plan was likely to be unconstitutional.

The campus of Texas A&M University. Conservatives are pushing for changes in college requirements The range of courses college students can take to meet general education requirements is narrowing in some right-leaning states. In Texas, for example, students at some of the state’s biggest public universities can no longer use courses in women’s studies or climate change to fulfill graduation requirements. In Florida, public universities no longer allow introductory sociology courses to satisfy core requirements. Supporters of the changes argue that core curriculums should never have included classes that they see as advancing left-leaning ideologies. Critics say the process seems more about politics than pedagogy. For more on higher education: A group of pro-Palestinian former student activists, including Mahmoud Khalil, sued Columbia University, saying it was deliberately indifferent to their harassment. Worried about your college kid? Some parents are hiring local moms. More top news Markets: The 10-year Treasury yield, one of the most important interest rates in the world, briefly rose to 5 percent today, its highest level in three years. Immigration: D.H.S.’s internal watchdog said that the “Alligator Alcatraz” detention center had confined migrants in small cages and violated other federal standards. Health: In the latest advance in brain-computer interfaces, a patient with a paralyzing neurological disorder used a brain implant to converse in real time. Middle East: As the widening conflict threatens oil markets, Crown Prince M...