b'Stocks failed to hold an early rally in an up-and-down session, with the Dow giving up most of its earlier 335 point gain. Julian Emanuel from Evercore ISI and Nancy Tengler from Laffer Tengler break down how they are approaching this uncertain trading environment. Meantime Apple kicked off its Worldwide Developers Conference at its California headquarters. Wedbush\\u2019s Dan Ives and Colin Gillis from Chatham Road discuss the biggest announcements, including new software and hardware products. And the CEO of Marriott weighs in on travel demand and what he\\u2019s seeing right now from his customers.'