Washington, Aug. 24 -- President Donald Trump angrily escalated his trade fight with China on Friday, raising retaliatory tariffs and ordering American companies to consider alternatives to doing business there.

He also blamed Jerome Powell, the man he appointed as chairman of the Federal Reserve, for the state of the domestic economy, wondering who was a "bigger enemy" of the U.S. - Powell or Chinese President Xi Jinping.

Even by the turbulent standards of the Trump presidency, his actions, all done via Twitter, were notable, sending markets sharply lower and adding to a sense of uncertainty on the eve of his trip to France for a meeting of global economic powers.

Trump's move came after Beijing announced Friday morning that it had ra...