PHILADELPHIA — Hillary Clinton is set to become the first female presidential nominee on Tuesday, but her historic achievement could be clouded by a significant faction of liberal Democrats who are still clamoring for socialist Bernie Sanders to head the party ticket in November.

The Democratic National Convention convenes at 4 p.m., when party officials will conduct a roll call of the states that will crown Clinton the winner. But rather than showcasing a celebration for Clinton, the convention floor could end up displaying the deep divide between the Sanders and Clinton delegates.