U.S. President Donald Trump signed an executive order launching an investigation into the national security risks of the country's reliance on imported processed critical minerals, the White House said on Tuesday.

Donald Trump has threatened to apply tariffs on critical minerals in a move that could increase tensions with China and open a new front in a global trade war that has rattled markets. In an executive order on Tuesday,

California Gov. Gavin Newsom sued the Trump administration on Wednesday, challenging the president's authority to impose sweeping tariffs that have set off a global trade war. The lawsuit argues that President Donald Trump's use of the International Emergency Economic Powers Act to impose tariffs on Mexico,

President Trump’s unlawful tariffs are wreaking chaos on California families, businesses, and our economy — driving up prices and threatening jobs,” Newsom said in a stat

Harvard said it would not bend to the government's demands, prompting the Trump administration to freeze $2.2 billion in funding for the university.