President Trump on Thursday imposed once unthinkably high U.S. taxes on imports from dozens of countries, part of his campaign to turn one of the world’s most open economies into a fortress bristling with barriers to trade.

The president’s trade war entered a new phase on Thursday with hefty levies on scores of countries taking effect, adding further uncertainty.

President Trump and Russian President Vladimir Putin are discussing meeting in the United States, multiple sources tell CBS News.

The Aug. 15 summit will mark the first time the U.S. and Russia leaders will be together in person during President Trump's second term.

That law ensures that Americans benefit from inventions funded through taxpayer dollars, a senior administration official said. The letter demands that Harvard provide by September 5 a list of all patents stemming from federally funded research grants,