Krauthammer was surprised the lawsuit wasn’t about civil rights. I am too. I thought that was everyone was so up in arms over.
The Supremacy Clause says federal laws power over state laws. Article 6, clause 2 of the U.S. Constitution that states that laws made "under the authority of the United States, shall be the supreme law of the land; and the judges in every state shall be bound thereby, anything in the Constitution or laws of any state to the contrary notwithstanding."