President Trump is doubling down on his global trade war after a turbulent week on Wall Street. NBC New business and data correspondent Brian Cheung has the latest on the markets. Also, NBC News White House correspondent Aaron Gilchrist joins Ana Cabrera to report more on the Trump administration's changes to the economy. For more context and news coverage of the most important stories of our day click here: https://www.msnbc.com/ » Subscribe to MSNBC: https://www.youtube.com/msnbc » Subscribe