Well he did have this to say about it so he certainly supports the decision:

Today’s ruling by the U.S. Supreme Court provides state and local officials the definitive authority to implement and enforce policies to clear unsafe encampments from our streets. This decision removes the legal ambiguities that have tied the hands of local officials for years and limited their ability to deliver on common-sense measures to protect the safety and well-being of our communities.

“California remains committed to respecting the dignity and fundamental human needs of all people and the state will continue to work with compassion to provide individuals experiencing homelessness with the resources they need to better their lives.”