Donald Trump is narrowing the gap with Hillary Clinton in Pennsylvania. | Getty Poll: Trump closing gap in Pennsylvania

Just two days before the first presidential debate, Donald Trump is narrowing the gap with Hillary Clinton in the key state of Pennsylvania, a Morning Call/Muhlenberg College poll released Saturday shows.

There is now a 3-point difference between the Democratic and GOP nominees, with Clinton leading 44 percent to 41 percent among likely voters in a head-to-head matchup, according to the poll. The difference is within the margin of error, which is 5 points. Last week, Clinton held a 9-point lead over Trump, 47 percent to 38 percent.

With Libertarian candidate Gary Johnson and Green Party candidate Jill Stein added, the gap shrinks to 2 percentage points, with Clinton and Trump polling at 40 percent and 38 percent, respectively. Johnson is at 8 percent and Stein at 3 percent.

In the Pennsylvania Senate race, GOP Sen. Pat Toomey leads Democratic challenger Katie McGinty 41 percent to 40 percent, the poll found. In that poll, the margin of error is also 5 points.

The poll was conducted between Sept. 19-23, amid reports of the blast in New York and bomb threat in New Jersey. There were 486 likely general election voters surveyed by telephone, with 251 surveyed on landline and 235 surveyed by cellphone. Chris Borick, director of the Muhlenberg College Institute of Public Opinion, told Morning Call those events likely contributed to rising support for Trump within his own party.