The president gave a televised speech that featured repeated rants against Democrats and his predecessor, Joseph R. Biden Jr., along with boasts about gains that many Americans have said they are not experiencing.

The economy was a strength for President Donald Trump during last year’s presidential campaign and much of his first term, but polls show it’s become a weakness in recent months. President Donald Trump’s speech will start less than 12 hours before the Labor Department releases the first official inflation reading since a six-week government shutdown disrupted the collection of official economic data and left policymakers flying partly blind.