Mr Trump stuck close to his scripted economic message, reading from a binder in front of him in a news conference at his New Jersey golf club.
A day earlier, he struggled to make a sustained case for his economic policies during a meandering speech that his campaign had billed as a major policy address.
“Kamala Harris is a radical California liberal who broke the economy, broke the border and broke the world, frankly,” Mr Trump told reporters.
Mr Trump was flanked by popular grocery store items – including instant coffee, sugary breakfast cereals and pastries – laid out on tables as he highlighted the cost of everything from food to car insurance to housing.
The event came one day after the Labour Department announced year-over-year inflation had reached its lowest level in more than three years in July — the latest sign that the worst price spike in four decades is fading.
But consumers are still feeling the impact of higher prices — something Mr Trump’s campaign is banking on to motivate voters this autumn.
Ms Harris is planning her own economic policy speech on Friday in North Carolina, promising to push for a federal ban on price gouging on groceries.
A small crowd of Trump supporters watched his news conference from the periphery, occasionally cheering him on. But without a crowd of thousands to please with red meat attacks on his enemies, Mr Trump stuck closer to his prepared remarks.
Hours before the news conference, Mr Trump’s campaign leaders announced they were expanding his staff, bringing a number of former aides and outside advisers formally into the fold.
Corey Lewandowski, Taylor Budowich, Alex Pfeiffer, Alex Bruesewitz and Tim Murtaugh will advise the campaign’s senior leadership.
Summer has traditionally been the time for shake-ups in Mr Trump’s two prior campaigns. This year’s change comes weeks after the campaign itself was transformed by Mr Biden’s decision to end his re-election campaign and endorse Ms Harris.
