the president flirting with this tweet directed at america's business community. our great amare companies are hereby ordered to start looking for an altern toov china. the dow plunge more than 600 points as the president headed to his meeting with world leadersers already nervously eyeing a slowing world econaim threatened fr threat furtherer by trade wars. for better or worse has delivered and now real questions are being raised about whether the united states can be counted on to provide the leadership the world has come to expect since the end of the second world war. >> getting a lot of money in tariffs. >> reporter: as president trump meets with u.s. allies, his own volatility is raising questions about his ability to manage theworld's largest one. the president is ratcheting up his trade war with china, threatening to raise taxes on chinese goods.