Stock futures were steady Tuesday as investors remained cautious ahead of

inflation data and developments in the Middle East.

Brent extended the previous session's gains, trading at nearly $90 a barrel, as talks to reopen the crucial Strait of Hormuz waterway hit an impasse.

President Trump responded yesterday with new demands for Iran, writing on social media that the country should pay compensation for people who have been killed in conflict and protests.

"Markets found a darker cloud in the inflation outlook yesterday, as oil prices rose again amid the absence of a deal to reopen the Strait of Hormuz," said Deutsche Bank. Monday's moves "pushed things in a more hawkish direction."