Oil prices fell about 2% to a two-week low on Tuesday on expectations OPEC+ will boost output even as U.S. President Donald Trump's on-again off-again trade tariffs could reduce global economic growth and demand for the fuel. Trump's push to reshape world trade by imposing tariffs on imports into the U.S. has made it probable that the global economy will slip into recession this year, according to a majority of economists in a Reuters poll. China, hit with the steepest tariffs, has responded with its own levies against U.S. imports, stoking a trade war between the top two oil-consuming nations.