WASHINGTON—Attorney General Jeff Sessions said Monday morning he expects President Donald Trump to explicitly condemn white supremacists, in the wake of deadly violence at a weekend rally in Virginia and growing pressure on Mr. Trump to break decisively with nationalist groups that backed his campaign and presidency.

“He will say what he believes is appropriate, I think he probably will,” Mr. Sessions said in an interview on ABC’s Good Morning America, when asked if he believed Mr. Trump would condemn the groups by name.

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