Trump posts 'BE COOL!' and tells people 'this is a great time to buy' as his tariffs rattle world markets

President Donald Trump said it was a good time to buy in the markets as traders continued to digest his sweeping tariffs.

Mandel Ngan/AFP/Getty Images

• President Donald Trump said, "THIS IS A GREAT TIME TO BUY!!!"
• Global markets continue to react to the president's sweeping tariffs.
• The Dow and S&P 500 went up slightly after Trump's statement.

President Donald Trump on Wednesday urged calm as global markets continue to be upended by his wide-reaching trade war.