President Donald Trump will road-test his claims that he’s tackling Americans’ affordability woes at a Tuesday rally in Mount Pocono, Pennsylvania—shifting an argument made in Oval Office appearances and social media posts to a campaign-style event.

The trip comes as polling consistently shows that public trust in Trump’s economic leadership has faltered. Following dismal results for Republicans in last month’s off-cycle elections, the White House has sought to convince voters that the economy will emerge stronger next year and that any anxieties over inflation have nothing to do with Trump.

The president has consistently blamed his predecessor, Democrat Joe Biden, for inflation even........

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