Dow plunges more than 600 points as Amazon tumbles

The Dow dropped 643 points on Monday, before recovering to close down more than 400 points. The drop began after President Trump attacked Amazon, again, on Twitter, driving Amazon shares down 5%.

Difficulties in the tech sector, including Tesla's tumultuous week and Facebook's data scandal, as well as concerns of a potential trade war with China, have also contributed to the drop.