An attorney for Hunter Biden has sent two top House Republican committee chairmen a letter that appears to destroy their claims of contempt of Congress, declaring the subpoenas they sent demanding the President’s son’s testimony are “legally invalid” – while using their own against them. “I write to make you aware (if you are not already) that your subpoenas were and are legally invalid and cannot form a legal basis to proceed with your misdirected and impermissible contempt resolution. And you two, of all people, should know that is the case,” Biden attorney Abbe Lowell wrote on Friday to Jud…