Hillary Clinton has increased her lead over Republican presidential nominee Donald Trump in the battleground state of Pennsylvania, according to a new poll released Monday.

According to a new Susquehanna poll, Clinton holds a 10-point advantage over Trump, leading a head-to-head matchup with 47 percent support to Trump's 37 percent. Seven percent of poll respondents were undecided.

Meanwhile, Clinton's lead sits at 9 points when third-party candidates are factored in. In a four-way matchup, Clinton's 46 percent leads Trump, who remains stagnant with 37 percent. Libertarian nominee Gary Johnson peels off 7 percent, while Green Party cabdudate Jill Stein takes 3 percent support.

Both Clinton and Trump are viewed at unfavorably by at least a plurality of Keystone State voters. Forty-nine percent view Clinton unfavorably, compared to 40 percent who do so favorably. Meanwhile, 57 percent view Trump unfavorably, with only 35 percent viewing him in a favorable light.

Overall, only 11 percent of voters say they are not set with their vote and could be swayed before Election Day. Eighty-eight percent say they are strongly supporting their preferred choice.

The lead is a jump from the latest RealClearPolitics average, where Clinton holds an 8-point advantage over the real estate mogul.

Pennsylvania has become as important as anywhere for Trump's chances of eclipsing 270 electoral votes, with Trump putting the time into the state since becoming the party's presumptive nominee. Thus far, he has made four stops in the state, with two coming since the Republican National Convention.

Vice presidential nominee Mike Pence is set to hold a pair of events in Pennsylvania on Tuesday — at 3 p.m. town hall in Lancaster and 7 p.m. campaign event in Pittsburgh.