Philadelphia’s Republican mayoral nominee says he is not surprised by the resignation of the city’s police commissioner Daniele Outlaw.

"It’s about time," David Oh told Fox News. "I just felt she was very hamstrung here with an administration that was strained in its relationship with its own police officers."

Danielle Outlaw announced her resignation Tuesday in a statement with Mayor Jim Kenney’s office after more than three years of service.

"I think she tried to do a good job, but after three and a half years, the morale in the police department is low and that morale has to be raised in order to deliver the level of services that we need to deliver in this city," Oh said.

Oh said that the mayor’s policies that are "disagreeable" to the police and "made her job challenging."

"She had the unenviable job of basically not having real power over her police department," he said.