How Will Trump Sell His Big Policy Bill to the American Public?

President Trump took a victory lap on Thursday night after the House passed his sprawling domestic policy bill, which he muscled through Congress even as many in his party fear it will leave them vulnerable to political attacks ahead of next year’s midterm elections.

In a campaign-style speech at the Iowa State Fairgrounds, a jubilant Mr. Trump celebrated the bill — and himself, asserting that he was fulfilling his campaign promises and transforming the American economy.

But amid the revelry after spending days cajoling lawmakers of his own party to back the legislation, the president now confronts a difficult new phase: selling a bill that polling suggests is broadly unpopular to the American public as Democrats furiously focus on how it helps the wealthy at the expense of working-class people.

That effort began in earnest at the kickoff of America250, a yearlong series of events to celebrate the 250th anniversary of the United States.

“Very simply the One Big, Beautiful Bill will deliver the strongest border on Earth, the strongest economy on Earth, the strongest military on Earth and ensure the United States of America will remain the strongest country anywhere on this beautiful planet of ours,” Mr. Trump said.

The president, who spoke for just over an hour in the sweltering heat, reminded his supporters of the executive orders he has signed, the trade deals he has negotiated and the immigration crackdown he has overseen during his first five months in office. But it was what he called his successes of the past two weeks — the U.S. strikes on Iran’s nuclear facilities, NATO increasing its military spending and the passage of the policy bill — that particularly pleased him.