US President-elect Joe Biden's son Hunter, a frequent target of Republican attacks during the 2020 election campaign, said Wednesday he is under investigation for potential tax violations. "I learned yesterday for the first time that the US Attorney's Office in Delaware advised my legal counsel, also yesterday, that they are investigating my tax affairs," Hunter Biden said in a statement released by his father's presidential transition team. "I take this matter very seriously but I am confident that a professional and objective review of these matters will demonstrate that I handled my affairs legally and appropriately, including with the benefit of professional tax advisors." mlm/JM