Former President and World War II Navy pilot George H.W. Bush was one of many veterans to benefit from a service dog during his retirement, and his dog Sully already has his next assignment now that Bush has passed.
Bush died at his Houston home Friday at age 94.
With hands on hearts, members of Bush's cabinet, lawmakers and Supreme Court justices honoured the 41st president as his flag-draped casket entered the Capitol Rotunda.
Sully has his own Instagram account; here he is shown "assisting with voting" as Mr Bush cast his ballot in last month's U.S. presidential mid-term election.
The crew, who flew the plane to Houston on Sunday, have been tasked with carrying out "Special Air Mission 41", the number a reference to Bush's place in the roster of America's presidents.More news: English couple thanks NYC police for finding lost ring
The body of former President George H.W. Bush will lie in state in the U.S. Capitol on Monday as his family and Americans mourn the loss of the 41st U.S. president. This website is not intended for users located within the European Economic Area.
In Texas, students, staff and visitors have been flocking to Bush's presidential library on the campus of Texas A&M University. "And the contrast between George H.W. Bush and the current president could not be more stark". Presidents are traditionally asked to eulogize presidents who have died - and in past state events like this, that has been the case - but the Bush family is unlike any other and has another president in the family who will fill that role.
The high court will be closed on Wednesday in recognition of the national day of mourning, rescheduling that day's oral arguments over Gamble v.
The custom-painted unit incorporates the colors of the Air Force One used during Bush's years as president, from 1989 to 1992. An invitation-only funeral service is set for Wednesday at Washington National Cathedral.
Baker said the elder Bush's last words were, "I love you, too", spoken to the younger President Bush, the country's 43rd president.
Afterward, Bush will be returned to Houston to lie in repose at St. Martin's Episcopal Church before burial Thursday at his family plot on the library grounds.