"The Democratic National Committee, sometimes referred to as the DNC, is again working its magic in its quest to destroy Crazy Bernie Sanders for the more traditional, but not very bright, Sleepy Joe Biden", Trump tweeted Sunday.
A Biden ally was even more blunt about his appeal. "Funny, I'm only here because of Biden & Obama. You built America. We built America".
Biden's Pittsburgh rally comes on the heels of a major labor union endorsement from the International Association of Fire Fighters (IAFF), which represents more than 316,000 full-time professional fire fighters and paramedics.
Former Vice President Joe Biden speaks in front of a Stop & Shop in support of union workers on April 18, 2019 in Dorchester, Massachusetts.
Biden argued that the nation's premise of the middle class was being undercut by a "one-way street" greedy companies with executives who pump money into salary increases and stock buy-backs rather than worker pay.
"We can see that Joe Biden thinks [Pennsylvania] is important because it is the first place he is coming for a public event", Laura Olson, the Washington correspondent for the Allentown newspaper The Morning Call, told Cheddar.
"Workers are not treated across the board with dignity", Biden said.
Biden also repeatedly said he would undo Trump's tax cuts, complaining that the benefits had accumulated with wealthy Americans and corporations.
The fervor inside the Teamsters union hall combined a nostalgia for President Obama with the conviction that Mr. Biden was electable and a belief that the former vice president would be a transitional figure on the way to the far-left government envisioned by party activists.
Trump disparaged both Biden and the endorsement in tweets claiming support from rank-and-file union members.
Pennsylvania will be a key battleground in the 2020 general election, and Biden is making an early play in the state. Trump went on to say despite the snub, "the members love Trump". Never mind that boosting the economy and employment was the main point of the Tax Cuts and Jobs Act of 2017. "Some things never change!" "Unions built the middle class in this country - and as President, I'll fight to strengthen them and grow the backbone of this country".
One of those people is Robert Wolf, who served on then-President Obama's White House jobs council and now helms the firm 32 Advisors.
In 2016, President Trump won every county in Western Pennsylvania besides Allegheny County, the home of Pittsburgh. "We need to start seeing action".
On Tuesday and Wednesday, Biden will make stops in Iowa during his first visit to the state as a presidential candidate.