U.S. stock index futures were down on Tuesday, pulling back after a sharp rally fueled by a U.S.-China trade truce, as investors turned their focus to a key U.S. inflation reading that could shape the outlook for monetary policy.

Wall Street is on track to open with losses Tuesday as the initial euphoria over the 90-day truce in the U.S.-China trade war faded and markets turned their attention to corporate earnings and new