Public Advocate Jumaane Williams got into a heated argument in Queens on Monday afternoon with the head of a correction officers’ union after making a surprise visit to Rikers Island.

Williams, the second highest-ranking citywide elected official, made the unannounced visit to Rikers Monday morning after, he said, his office received concerns of changes taking place at the Rose Singer Center — notably that of overcrowding in which male inmates have been housed in the female facility.