Biden said the government's surprising May report showing the addition of 2.5 million jobs in the middle of the coronavirus pandemic was just a first sign of recovery from a deep and broad recession.
"There is so much more work to be done. So many Americans are still hurting," Biden, the former vice president, said at Delaware State University, a historically black university in Dover.
Not everyone was benefiting from the improvement, Biden noted, as the African-American unemployment rate rose slightly.
Trump, who has been counting on a quick economic turnaround to boost his chances against Biden in the Nov. 3 election, was quick to take credit at a White House news conference, and said the economy could regain all of its lost jobs by next year.
Biden said Trump's celebration while so many Americans were still struggling was a sign of how out of touch he was.
"The president who takes no responsibility for costing millions and millions of Americans their jobs deserves no credit when a fraction of them return," Biden said.