NYT > Economy 

So proclaimed President Trump at a rally in Arizona on Tuesday, raising the specter of a federal government shutdown if Congress fails to provide the money to put up a wall between Mexico and the United States. And with those words, the president managed to rattle investors in two big financial markets -- United States Treasuries and stocks. In recent years, government shutdowns have become so common that markets have either embraced them or shrugged them off. Noting that during the past three shutdowns, the stock market was unfazed by the political gamesmanship, Mr. Boltansky said, "I think this time will be worse because of the uncertainty from President Trump."