Harris leading Trump in 5 of 7 key battleground states

Kamala Harris is gaining momentum in the presidential race, leading Trump in five of seven key battleground states according to a Cook Political Report poll. The candidates are tied in Georgia, and Trump leads in Nevada, but Harris is closing the gap. The campaign landscape has shifted since Biden dropped out, with previous polls showing Trump leading or tied with Biden. A national poll by Fox News shows Trump with a slight edge over Harris, but the lead is within the margin of error.

What does the latest national poll indicate about Trump's lead over Harris?

What was the margin of error in the poll showing Trump's lead?