Authorities are trying to determine who spray-painted the words "NO TRUMP" and "PUNCH NAZIS" on a sign at Rowan University in Glassboro.
A faculty member and a borough resident reported the graffiti around 9:30 a.m. Sunday on the sign for Hollybush Mansion, a historic building at the edge of campus near Summit Lane and Whitney Avenue.
Joe Cardona, a university spokesman, said crews quickly removed the black spray-painted graffiti, which he added might have been scrawled early Sunday.
Hollybush Mansion was built in 1849. In 1967, then-President Lyndon B. Johnson and Soviet Premier Alexei B. Kosygin met at the building during a three-day summit in an attempt to improve relations between the countries.
The building is now a museum and meeting center, according to the university's website.