Trump says former Vice President Joe Biden should be investigated over allegations that his family pocketed millions from the Chinese government.
"We are here to support Joe Biden".
Democrats and Republicans both view Pennsylvania, which has 20 electoral votes, as one of the most important battlegrounds in the 2020 race.
But before Biden can compete against Mr. Trump in the 2020 election, he must clench the Democratic nomination - a feat nowhere near locked down as the field of candidates continues to grow. "They say Democrats are so angry, and that the angrier your campaign will be, the better chance you have to win the Democratic nomination. Well, I don't believe it". "You have to talk on all of those forces of the status quo who do not want to move this country to energy efficiency and sustainable energy". "That's what our party's always been about".
"I know President Trump likes to take credit for the economy's growth and low unemployment numbers, but just look at the facts - not the alternative facts", Biden told the crowd (estimated to be around 6,000 people).
Prior to Biden's speech, the Republican National Committee in a release pointed to statistics showing how Pennsylvania's economy has improved during Trump's presidency. So I want an even-handed policy which brings people together.
Saturday's address is the longtime DE senator's first public appearance in Pennsylvania since announcing his campaign headquarters would be in Philadelphia.
Mr Trump narrowly won the state over Hillary Clinton in 2016.
Biden is betting big that voters in the Midwest and beyond will ultimately embrace his optimistic appeal.
Those remarks came after Biden's campaign announced earlier this week that it will be based in Philadelphia.
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He is now being investigated by police over comments speculating about whether he should rape a female MP. "Have fun. A sign posted on the McDonald's window read: "We will not be selling milkshakes or ice creams tonight".
If they needed to organize a union, former Vice President Joe Biden would support his campaign aides.
"Has he been living in the Trump era?"
Trump has insisted he does not see Biden "as a threat". He has also argued that he is the best candidate to take over from the Trump administration next year.
"I think that Joe Biden would be a great running mate", she told reporters. A spokeswoman later said Biden does not believe Trump is an illegitimate president.
With Biden the clear frontrunner, those attacks are likely to intensify.
Biden, a senator from DE for 36 years and vice-president to Barack Obama from 2009 to 2017, was a relatively late entrant to the sprawling field seeking the Democratic nomination in 2020.
"If the American people want a president to add to our division, to lead with a clenched fist, closed hand, a hard heart, to demonize the opponents and spew hatred - they don't need me, they've got President Donald Trump".
His message, Biden said, was expressly aimed at Democratic, Republican and independent voters alike. But he described himself as "damn angry" about the Trump presidency. "Somebody needs to calm us down a little".