Wall Street Preview: Tech Stocks Are in Focus

U.S. stock futures declined and shares in Europe fell amid a weak U.S. dollar, rising political tensions in the Gulf region and electoral risks in the United Kingdom.

The U.S. dollar index, a measure of the currency's strength against six of its global peers, fell 0.5% to 96.75 as investors continued to react to softer data from the world's biggest economy and positioned themselves ahead of potential testimony Thursday from former FBI director James Comey.

Oil prices edged lower in the U.S. early Tuesday, down 0.2% to $47.39 a barrel, as a diplomatic row between Qatar and its Gulf neighbors intensified.

This article was written by a staff member of TheStreet.