Sen. Sheldon Whitehouse (D-RI) demanded answers from U.S. Supreme Court Justice Samuel Alito Monday about an “improper” interview he gave to the Wall Street Journal about regulation of the highest court in the land. The conservative justice in July sat down with the paper and argued, “No provision in the Constitution gives [Congress] the authority to regulate the Supreme Court — period.” The comments were made after ProPublica published claims that Justice Clarence Thomas accepted gifts from a billionaire, but just before it reported a GOP donor paid fora luxury fishing trip to Alaska for Alit…