Kamala Harris, Donald Trump campaign in battleground Pennsylvania

The official, who spoke on the condition of anonymity to preview the remarks ahead of a campaign rally in Erie, said Harris will hammer home the idea that Trump sees Americans who disagree with him as enemies.

She'll argue that the comments made in a Fox News SundayFox News SundayFox News Sunday Morning Futures interview are the latest example of threatening rhetoric from the former president that should concern Americans about what a potential second Trump term could look like.

Trump, responding to a question about outside agitators potentially disrupting Election Day, pivoted to a foe closer to home.