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President Donald Trump continued his campaign against Amazon.com on April 3, again claiming the company is costing tax payers billions of dollars through a special deal with the U.S. Postal Service.

The security reasons given by the White House for imposing tariffs on Europe make no sense, the prime minister of Denmark said as he questioned the underlying logic of U.S. trade policy.

China will respond to any tariffs imposed by the U.S. against alleged violations of intellectual property rights with the same proportion, scale and intensity, said its U.S. ambassador Cui Tiankai.

California began accepting applications April 2 for permits to deploy self-driving cars on public roads without a human backup driver at the wheel.

A trucking company that hauls loads for a federal laboratory has requested an exemption from the electronic logging device rule, according to a document scheduled for publication in the Federal Register on April 4.

Stock prices opened the second quarter with another sharp decline April 2 as investors grew increasingly worried about the rising U.S. trade dispute with China and a flurry of problems hammering the nation’s marquee technology firms.

The Trump administration is pushing for a preliminary NAFTA deal to announce at a summit in Peru next week, and will host cabinet ministers in Washington to try to achieve a breakthrough, according to three people familiar with the talks.

The Trump administration announced that fuel-efficiency regulations for cars and light trucks are too stringent and must be revised, formally beginning a process sought by the U.S. auto industry to rollback anti-pollution targets.

Drone programs can expand traffic management and bridge inspection opportunities for states, but they can also create savings to benefit other projects, according to one transportation official whose agency has been using the devices for nearly a year.

U.S. lawmakers have applied a light touch in regulating robot cars. At the national level, the Trump administration has proclaimed that driverless-car guidelines should be “entirely voluntary” for automakers, and bills pending in Congress would clear the way to putting tens of thousands of autonomous cars on the road — orders of magnitude more than the few hundred in the country today — before federal safety regulations are set.