Republican presidential nominee Donald Trump vowed Wednesday that his campaign would win Pennsylvania "easily", despite a recent poll showing him trailing Democratic nominee Hillary Clinton by double digits. 

"I think we're going to do very well in Pennsylvania," Trump told Fox News' "On the Record with Greta van Susteren." The real estate mogul claimed his popularity with working class voters, including coal miners and steelworkers, would put him over the top in the Keystone State.

A recent Quinnipiac University poll of likely voters showed Clinton getting 52 percent of the vote in Pennsylvania to 42 percent for Trump. When Libertarian candidate Gary Johnson and Green Party candidate Jill Stein were included in the poll, Clinton still had the edge over Trump 48 percent to 39 percent. 

In addition, the Fox News electoral scorecard put Pennsylvania in the "Lean Democrat" column. 

With 20 electoral votes at stake, Pennsylvania is considered vital to Trump's chances of taking the White House. However, he will have to overcome a strong historical trend: The state has not voted for a Republican presidential candidate since George H.W. Bush in 1988.

Also Wednesday Trump again defended his remarks about Hillary Clinton and the Second Amendment, which some took as an incitement to violence against the former Secretary of State. 

"What we’re talking about is political power," Trump said. "There is tremendous political power to save the Second Amendment, tremendous, and ... you look at the power [gun rights supporters] have in terms of votes and that’s what I was referring to, obviously that’s what I was referring to and everybody knows it."

Referring to Clinton, Trump said, "She's very much against guns and I'm a very pro-Second Amendment person. People want the Second Amendment protected and they have a lot of power in doing it."