On Saturday night he tweeted: "Regarding Rittenhouse Square, I'm frustrated too. This government is very large and at times things just get by you. Sit where you want."
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"Along with my liberal view of park use, please don't litter, or graffiti the walls or smoke weed so obviously that you scare olds my age," he said in a follow-up tweet.
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It comes after new signs were put up at the park this week warning people to stay off the walls.