There is news of a possible repatriation tax holiday. Many large US companies have cash stuck overseas. A tax holiday would allow them to bring it back to repurchase shares or do US based acquisitions. The best way to play it would likely be the QQQ or the OEX (S&P 100).
The QQQ has tech and biotech companies, which do a lot of their business overseas. The OEX has most of the large multinationals. There will likely be a buying opportunity further down the road as people have been piling into these names since the announcement.