'He will be greatly missed!': Donald Trump mourns the death of globally acclaimed attorney David B. Rivkin Jr

US President-elect Donald Trump mourned the death of attorney David B. Rivkin Jr. Trump praised Rivkin's contributions to law and public service. Rivkin's career spanned constitutional, administrative, and international law, including a landmark Affordable Care Act case. He also worked on national security and environmental policy during the George H.W. Bush administration, leaving a significant impact.