President-elect Donald Trump has created a headache for the Federal Reserve before he's even stepped into office. Inflation, part of the Fed's dual mandate of maintaining price stability with maximum employment,

The Consumer Price Index rose 2.9 percent from a year earlier, but a measure of underlying inflation was more encouraging.

Annual inflation ticked up for a third straight month in December as food, energy costs rose, CPI report showed. But underlying price measure eased.