WASHINGTON (AP) — President Donald Trump launched a furious and highly personal Twitter attack Friday against the Federal Reserve and Chairman Jerome Powell, fuming that the Fed once more "did NOTHING!" and wondering who is "our bigger enemy" — Powell or China's leader.

The outburst came after Powell, speaking to central bankers in Jackson Hole, Wyoming, gave vague assurances that the Fed "will act as appropriate" to sustain the nation's economic expansion. While the phrasing was widely seen as meaning interest rate cuts, he offered no hint of whether or how many reductions might be coming the...