Seattle City Councilmember Lorena Gonzalez asked the mayor to consider stepping down Monday after an Oregon investigation was published showing Ed Murray sexually abused his foster care son.

Gonzalez said in a statement that she is “deeply concerned” about Mayor Ed Murray’s ability to lead after the documents were revealed in the Seattle Times on Sunday.

“This situation is unprecedented in our city’s history,” Gonzalez said in a statement. “We cannot pretend otherwise.”

If Murray does not step down, Gonzalez pushed the City Council to determine by July 24 if a transition in leadership is necessary.

“A collaborative approach is my preferred approach but the leadership of this City, including the Mayor, must proceed in a manner that will balance the ongoing need to effectively govern while acknowledging the grave harm caused by proceeding with a status-quo mentality,” Gonzalez said in a statement.

An Oregon Department of Human Services child-welfare investigator found that Ed Murray sexually abused Jeff Simpson while Simpson was in Murray’s care in 1984. The report prompted the state to determine Murray should never serve as a foster care parent in the future.

Gonzalez wrote that she took the documents seriously, and they raised “grave concerns,” including “creating a chilling effect on the willingness of other similarly-situated sexual abuse survivors to come forward and break the silence.”

Councilmember Lisa Herbold urged Murray to stop referencing Simpson’s criminal background to defend himself, saying she was…