Federal Reserve Board Chairman Alan Greenspan and two key economic aides to U.S. President George W. Bush on Wednesday urged Japan to do more to put its flagging economy on a steady recovery track and serve the interest of the global economy.

In testimony to Congress, Greenspan said Japan should do more to prevent its ailing economy from affecting the rest of the world.

U.S. Treasury Secretary Paul O'Neill, speaking during a visit to Toronto, said Japan is moving "far below its economic growth potential."

"It's pretty clear the world would be better off if Japan was growing at 3 percent real growth," O'Neill told reporters.