U.S., China remain at odds on numerous issues as Blinken finishes first day of meetings in Beijing

For decades, global commerce abided by tariff rates agreed to by the U.S. and 122 other countries during the 1980s and 1990s. On Wednesday, Trump detonated that arrangement.

The review will also look at other defense officials use of the the publicly available encrypted app, which is not able to handle classified material.

U.S. Rep. Brendan Boyle, who represents parts of Philly and is co-chair of the Congressional European Union Caucus, called the move "a direct threat to our national security.”