Monuments came down in Baltimore on Wednesday and Durham, North Carolina, on Monday.
Poland is removing all statues and memorials to totalitarian regimes, including those to Soviet soldiers.
"If it does not work at least the steps will be cleaned" he said.
The plaintiffs wanted to destroy a memorial based on motives that are an insult to brave Americans.
Two churches in the Southwest U.S. also made the list of 50 sites.