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Watch as Donald Trump visits the frontier with Mexico in Montezuma Pass, Arizona, on Thursday 22 August.
The Republican candidate for November’s election is making a trip to the US border on the same day Kamala Harris is set to accept the Democratic Party’s nomination.
He is expected to speak about immigration policy in Arizona, a key swing state, as Republicans try to derail Ms Harris’ momentum by drawing attention to a critical election issue.
Back in Chicago, where the 2024 Democratic National Committee is being held, Ms Harris plans to talk about her life as the daughter of a Jamaican father and Indian mother and lay out her plans to tackle rising costs and advance personal freedoms.
She will also deliver a robust denunciation of former president Trump, according to aides.
Ms Harris has raised a record-breaking $500 million in a month and has narrowed the gap or taken the lead against her Republican rival in many opinion polls of battleground states.