The steel plant in Bethlehem, Pennsylvania made parts for the Golden Gate Bridge, the Hoover Dam and the mighty US battleships that fought in World War II.

Today, the plant lies idle and abandoned having closed years ago.

The enormous, rusting smoke stacks and blast furnaces still dominate the skyline.

Bethlehem's steel mill dominates the local skyline

Donald Trump promised to bring industries like steel and coal back to Pennsylvania and the so-called "rust belt" vote, which used to be solidly Democrat, flipped and went for Mr Trump back in 2016.

It helped him to win the state of Pennsylvania, and the White House, by the tiniest of margins, but now he is under pressure in the polls here and nationally.

Joe Biden was born in working class Scranton, Pennsylvania and is seen by many in this state as one of their own.

On the campaign trail he regularly contrasts his blue-collar, Irish-Catholic roots with Donald Trump's billionaire lifestyle, pushing an election message of "Scranton versus Park Avenue".

"All that President Trump could see from Park Avenue is Wall Street. All he thinks about is the stock market," he regularly tells supporters.

Professor Chris Borick says polls pointing to Joe Biden win in Pennsylvania

Chris Borick is a professor of political science at Pennsylvania's Muhlenberg College.

He says that right now, the polls are pointing to a probable Joe Biden win in Pennsylvania.

"If Joe Biden has a lead in the polls in early November in the mid-single digits in Pennsylvania that's a pretty hard number for the president to overcome but not impossible. I think it is harder terrain for the president this time around," he said.

In downtown Bethlehem, Pennsylvania, Scott Hough is on the campaign trail meeting with voters and handing out flyers.

He is a Republican candidate running to become a state representative and says Donald Trump's performance in office often comes up on the doorsteps.

State Republican candidate Scott Haugh

"Some folks will slam the door in your face and not want to talk to you because you have the title Republican after your name, but the majority of people here in Bethlehem are very fair-minded, hard-working people and they are will to have a conversation," he said.

"That's why I am are running because I feel what's lacking right now is people sitting down, having a conversation and trying to find common ground."

A mix of Donald Trump and Joe Biden lawn signs line the residential streets of this Pennsylvania town and it is a divide that is reflected in the views of voters here.

Barbara Gallowich says she will be supporting Joe Biden.

"I had hopes for Donald Trump, but I don't think he's come through, all the lies. He's just not a very honest man", she said.

Voter Barbara Gallowich says she will be supporting Joe Biden 

Robert Holland voted for Donald Trump back in 2016 and has no regrets.

"He's doing a wonderful job and is the most knowledgeable president we've had in my lifetime. He's courageous, we're going in the right direction and I hope people give him another four years," he said.

Donald Trump's victory here was forged in the shadows of abandoned steel mills and coal mines.

Professor Borick believes that many who voted for him probably knew deep down that he was never really going to reopen those industries, but backed Mr Trump anyway out of a sense of nostalgia and a desire to return to an America of the past.

"Coal hasn't returned to Scranton, steel hasn't returned to Bethlehem, but despite this, his broader message still resonates with many voters," he said.