Wall Street edges lower amid overseas issues; energy falls

U.S. stocks edged lower on Tuesday, with the S&P 500 pulling back from record levels as investors continued to grapple with the uncertainty over a Greek debt deal and a fragile Ukraine truce. Much of the advance came on signs of progress for the debt deal in Greece, as well as reduced tension between Russia and Ukraine. European Union finance ministers pressured Greece to remain in an international financial rescue program after talks collapsed on Monday. U.S.-listed shares of the National B