Some members of the US Federal Reserve are urging the bank to consider raising interest rates quicker, in what could mark a turn from the gradual approach it has taken in recent years.
They expect stronger economic growth and inflation to warrant more aggressive action over the medium term.
Their views were laid out in the minutes of the bank's March meeting, published on Wednesday.
Share markets, which watch rates closely, dipped on the release.
The Fed uses interest rates as its primary tool to keep the US economy on a path of sustained growth and controlled inflation.