Hunter Biden said he contacted his legal adviser on Tuesday about the matter and believed he had handled his tax affairs “legally and properly.” | Through Getty Images, Handout / TNCC said Wednesday that the U.S. Attorney’s Office in Delaware has opened an investigation into its tax. In a statement, Hunter Biden said he had contacted his legal adviser on Tuesday about the matter and hoped he had handled his tax affairs “legally and properly.” “I take this matter very seriously, but I hope that a professional and objective review will prove that I have handled my affairs legally and properly, including for the benefit of professional tax advisers,” Biden said.