Despite our differences on policy and politics, I respect Senator John McCain's service to our country and, in his honor, have signed a proclamation to fly the flag of the United States at half-staff until the day of his interment. I have asked Vice President Mike Pence to offer an address at the ceremony honoring Senator McCain at the United States Capitol this Friday.
At the request of the McCain family, I have also authorized military transportation of Senator McCain's remains from Arizona to Washington, DC, military pallbearers and band support, and a horse and caisson transport during the service at the United States Naval Academy. Finally, I have asked General John Kelly, Secretary James Mattis, and Ambassador John Bolton to represent my administration at his services.
NOTE: The statement referred to White House Chief of Staff John F. Kelly; and National Security Adviser John R. Bolton.
Donald J. Trump (1st Term), Statement on the Death of Senator John S. McCain III Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/333141