A Donald Trump campaign billboard along a Phoenix freeway was defaced with swastikas.

Drivers commuting near the I-10 and I-17 interchange have a view of the presidential billboard, now covered in black spray-painted swastikas.

It's unclear exactly when the graffiti was placed on the billboard, but as of Monday morning, the paint is still covering the sign.

Trump is set to make a Tuesday appearance in Prescott Valley, Arizona.