U.S. stocks opened lower on Tuesday, with geopolitical uncertainty rising as investors awaited President Donald Trump's decision on the Iran nuclear deal.
The Dow Jones Industrial Average fell 0.2% to 24,308. The S&P 500 lost 0.2% to 2,668. The Nasdaq Composite Index was down 0.2% to 7,253. Both the S&P and the Nasdaq are coming off two positive sessions, while the Dow has gained for three.
Traders are watching for Trump's decision because abandoning the Iran deal would trigger a reimposition of economic sanctions on the Middle Eastern country. While this could provide support for crude-oil prices by limiting supply, the reaction to pulling out of the deal could add another element of political uncertainty into markets.