Article continues below advertisementEmbattled Secretary of Defense Pete Hegseth called for a new investigation into Arizona Democrat Sen. Mark Kelly on Sunday, May 10, alleging that Kelly may have violated his oath by disclosing classified information. This new dispute follows a major legal setback for Hegseth in an ongoing battle regarding Kelly's military rank and pension.Hegseth announced on social media that the Pentagon's legal counsel would review Kelly's comments made during an interview on CBS News' Face the Nation.