Stock futures were little changed and oil was barely higher, as traders watched Iran's reaction. U.S. health insurers are taking steps to speed up and reduce prior authorizations, which are often a headache for both patients and providers.

From trade wars to the threat of an actual kinetic war, seemingly nothing has managed to keep stocks down for long this year.

Stocks are set to open little changed from Friday's close, while gold and oil shrug off the escalation of war in the Middle East.