NEW YORK, June 30 (Reuters) - U.S. stocks turned negative on Tuesday after data showed consumer confidence fell in June after a sharp rise in May.

Consumer spending amounts to roughly two-thirds of the U.S. economy.

The Dow Jones industrial average .DJI dropped 22.60 points, or 0.26 percent, to 8,506.78. The Standard & Poor's 500 Index .SPX fell 3.64 points, or 0.39 percent, to 923.59. The Nasdaq Composite Index .IXIC lost 4.18 points, or 0.23 percent, to 1,839.88. (Reporting by Rodrigo Campos; editing by Jeffrey Benkoe)