Wall Street gave up some of its earlier gains after the US administration's unveiling of tax cut plans fell short on details.
Investors also questioned that the proposal was feasible.
"The plan that has been announced today is very aggressive, and unlikely to pass as is," Alan Gayle, a senior strategist at RidgeWorth Investments in Atlanta, told Bloomberg. "I haven't heard of anyone on the street that has been adjusting earnings estimates based on the likelihood we'll get tax reform. This remains an unknown and it's not being factored into the market yet."
In 2.32pm trading in New York, the Dow Jones Industrial Average rose 0.17 per cent, as did the Nasdaq Composite Index. In 2.18pm trading, the Standard & Poor's 500 Index increased 0.22 per cent. Earlier in the day, the Nasdaq touched a record high 6,040.90.
The Dow rose as gains in shares of Verizon and those of United Technologies, recently up 1.8 per cent and 1.4 per cent respectively, outweighed slides in shares of Procter & Gamble and those of Boeing, down 2 per cent and 1.1per cent respectively.