The delegation includes business leaders across a wide range of industries, including Tim Cook of Apple and Elon Musk of Tesla.

The company makes almost all of its products in countries facing steep levies, running up a tariff bill of $3.3 billion over the past three quarters.

© Doug Mills/The New York Times

President Trump fired the National Security Agency’s chief back in April and has weakened cyberattack protections.

© Eric Lee for The New York Times