ST. LOUIS, Sept 3 (Reuters) - The U.S. Federal Reserve should cut interest rates by half a percentage point at its meeting in two weeks to get ahead of both financial market expectations for a rate cut and a global trade war that has become a broader "reckoning" over how the world economy is organized, St. Louis Federal Reserve President James Bullard said in an interview on Tuesday.

Global investors have sent bond yields plummeting in recent weeks to record lows, leaving the Fed's overnight policy rate seemingly out of line, Bullard said.

Economic data on Tuesday meanwhile showed the U.S. manufacturing sector had contracted for the first time in three years amid slowing global economic growth and as China and the U.S. ratchet up tariffs on each other.

Bullard said he felt the situation amounted to a "global shock" that warranted an "aggressive" step by the Fed at its meeting in two weeks. In July, the Fed reduced borrowing costs by a quarter point, its first rate cut since 2008.

"We are too high," Bullard said of Fed interest rates, noting that the central bank's current target policy rate of between 2% and 2.25% was higher than the current yield of all U.S. Treasury securities. Typically the Fed's rate should form a baseline for the determination of other rates, but even the 30- year bond has dipped below 2%.

U.S. stocks slid on Tuesday, and benchmark Treasury yields hit their lowest in three years, as investors fretted that the drawn-out trade war was taking an increasing toll on the U.S. and global economy. European stocks also were down while safe-haven gold rallied.

RESPECTING THE SIGNAL

While central bankers often say they don't let financial markets dictate policy, "in this situation I would respect the market signal," Bullard said. "We should have a robust debate about moving 50 basis points at this meeting...It’d be better in my mind to go ahead and get realigned right now," rather than moving only a quarter point in September and again in October.

"Why do that? Why not just get to the right point today?"

Bullard's comments are the bluntest to date by a current voter on Fed policy endorsing deeper rate cuts in response to the wave of uncertainty touched off by rising tariffs, the sometimes whipsaw economic policy developments of recent months, and weak U.S. inflation.

Though the recommendation comes close to the sort of action President Donald Trump has demanded of the Fed, which he has accused of sabotaging his economic plans, Bullard's position is rooted in a dim view of where the trade debate is heading.