Trump's Oval Office tweets force CEOs to choose fight or flight

President Donald Trump is injecting himself into the daily business of US companies to an unprecedented extent, spurring investors and executives to weigh their exposure to his wrath when making decisions.
 
The latest was Nordstrom , which drew Trump’s public anger on Twitter Wednesday for discontinuing his daughter Ivanka’s line, saying sales had slumped. Trump shot back, first from his personal account, then retweeted from his official @POTUS account: “My daughter Ivanka has been treated so unfairly by @Nordstrom. She is a great person — always pushing me to do the right thing! Terrible!”
 
The tweet initially sent