U.S. Sen. Bernie Sanders is scheduled to appear Saturday afternoon in Allentown during a two-day swing through Pennsylvania to endorse Democratic candidates in the May 15 primary election.

The independent from Vermont, who ran as a Democrat for president in 2016, is slated to endorse Greg Edwards' Democratic candidacy for Pennsylvania's 7th Congressional District.

The appearance alongside Edwards is scheduled 2 to 4 p.m. at Miller Symphony Hall, 23 N. Sixth St. in Allentown.

Seating is limited, and advance registration is encouraged through eventbrite.com or through Facebook, organizers say. The event is free and general admission. Doors open at noon.

Edwards is one of six Democrats running in the newly created 7th District, covering Lehigh, Northampton and southern Monroe counties. The others are David Clark, Rick Daugherty, John Morganelli, Roger Ruggles and Susan Wild.

The Republicans running in the 7th District are Dean Browning and Marty Nothstein.

The Pennsylvania Supreme Court redrew the state's Congressional districts after ruling the old boundaries were too partisan. For now, the Lehigh Valley is split between Republican U.S. Rep. Charlie Dent's 15th Congressional District and Democratic U.S. Rep. Matt Cartwright's 17th Congressional District.

Dent said he is resigning this month, setting up a special election under the 15th District boundaries. Cartwright is running for re-election in the new 8th Congressional District.

Sanders has endorsed Edwards, an activist for human and civil rights, along with the 78 members of the Congressional Progressive Congress, according to Edwards' campaign.

"For the past 25 years, Greg Edwards has worked tirelessly to organize for justice in health care, education and economic dignity throughout the Lehigh Valley," Sanders says in a statement from Edwards' campaign. "From his work in the nonprofit sector, to his practice of nonviolent direct action, Greg is a proven progressive leader who has had the courage to speak out and fight for those left behind.

"The powerful grassroots movement behind Greg Edwards is championing Medicare for All, universal pre-k, debt free college and raising the minimum wage, and he is living his values of unwavering inclusion by building the diverse coalition Democrats need to win in his district."

Greg Edwards, one of six Democratic candidates for Pennsylvania's new 7th Congressional District, takes part in a candidates' forum and debate April 19, 2018, at Lehigh University in Bethlehem. (Lehighvalleylive.com file photo)

The senator is scheduled to make an appearance Friday evening in front of Philadelphia's City Hall for lieutenant governor candidate John Fetterman.

Fetterman endorsed Sanders for president in 2016's Democratic primary against Hillary Clinton. Sanders, however, didn't endorse Fetterman's unsuccessful candidacy in that year's Democratic U.S. Senate primary.

Fetterman is among four Democrats challenging incumbent Lt. Gov. Mike Stack, of Philadelphia, in May 15's primary.

Sanders is also slated to campaign Saturday for Democratic congressional candidate Jess King in Lancaster. King is uncontested for the nomination to challenge Republican U.S. Rep. Lloyd Smucker.

The Associated Press contributed to this report.

Kurt Bresswein may be reached at kbresswein@lehighvalleylive.com. Follow him on Twitter @KurtBresswein and Facebook. Find lehighvalleylive.com on Facebook.