Jensen Huang, Nvidia’s chief executive, was discussing artificial intelligence at the All-In Summit in Los Angeles on Monday when President Trump called him onstage. Trump dismissed A.I. safety concerns as a “hoax,” saying, “The robots are not going to be taking over the world.” The five-minute call, put on speaker, showed Trump siding with executives who argue safety worries are overblown and government regulation should be avoided.

Trump’s call followed backlash over the weekend to an appeal by Dario Amodei, chief executive of Anthropic, to slow A.I. development and tighten regulation. Amodei proposed independent auditors and regulators to coordinate safety standards. Leaders of other big A.I. labs, including Open AI, Space X and Google’s Deep Mind, backed his concerns, though they differed on proposals.

Huang, whose chipmaking company has become the most valuable in the world thanks to the A.I. boom, has grown closer to Trump since his return to the White House. Huang is also a skeptic of A.I. safety concerns, questioning whether predictions of doom are based on hard facts. “Whistle-blowing is fine,” Huang said. “The scientific prediction about the future is less fine because it’s not grounded in science, obviously.”

Microsoft on Monday released a 15,000-word draft of what it called a “code of conduct” for its own A.I.