U.S. stocks lose steam as hopes waver for U.S.-China trade deal

NEW YORK (Reuters) - Equity indexes on Wall Street gave up earlier gains on Tuesday amid uncertainty over the prospects for a U.S.-China trade deal, while demand for U.S. treasuries and precious metals grew, showing an appetite for less-risky investments.Bond market investors showed a cautious picture as the margin on interest rates on U.S. three-month Treasury bills over the yields on benchmark 10-year Treasury notes grew to its widest level since early 2007.Gold rose as investors sought cover..