A photo of George HW Bush's service dog lying downbeat besides the casket of his old master on Sunday has spread across social media, causing an outpouring of emotion.
This week will see four days of events including a state funeral at the National Cathedral in the USA capital on Wednesday.
Though they have only been together for a few months - Sully was given to the 41st President in June this year, after his wife Barbara Bush died - the photograph clearly shows how the pair struck up a strong bond together.
Trump ordered flags on the White House and public buildings flown at half-staff - an honour he did not initially accord Senator John McCain - and proclaimed Wednesday a day of national mourning.
Bush, who died at his Houston home at age 94, will be buried Thursday on the grounds of his presidential library at Texas A&M University.
Mr Bush was a decorated World War II pilot, diplomat and onetime Central Intelligence Agency chief who saw his son George follow in his footsteps to the Oval Office - making them only the second father-son duo in American presidential history, after John and John Quincy Adams.
Solemn preparations were underway Sunday for America's national farewell to George H.W. Bush, whose casket will be flown from Texas to Washington aboard a presidential aircraft to lie in state at the start of a days-long state homage.
After a speech from Vice President Mike Pence, Bush will lie in state in the US Capitol from Monday evening until Wednesday morning, under the watchful gaze of an around-the-clock honor guard. He was preceded in death by his wife of 73 years, Barbara; his second child Pauline Robinson "Robin" Bush; and his brothers Prescott and William or "Bucky" Bush.
Former prime minister Brian Mulroney, whose nine years in power overlapped with Bush's four, said in a written statement that he and his wife share in the Bush family's grief.
Bush visits a tent camp for quake survivors on the outskirts of Islamabad, Pakistan, in 2006.
"Our thoughts and prayers are with the entire Bush family during this hard time". About two hours later, Bush was gone.
In a recent essay, Clinton declared of Bush: "I just loved him".
"And 41 said, 'I love you, too, ' and those were the last words that he ever spoke", Baker said.
Although the two Republican presidents were in many ways polar opposites - the soft-spoken, patrician Bush reportedly once dismissed the blustering New Yorker as a "blowhard" and even voted for his rival Hillary Clinton - President Trump paid the late leader a gracious tribute, saying he had "inspired generations of his fellow Americans to public service". He opened his eyes.
Speaking to the media, America's VetDogs said Sully will stay at their NY headquarters over the festive season and then undergo physical and occupational therapy.
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May said on Yemen that "we remain deeply concerned about the humanitarian situation" and "the long-term solution is political". Current US president Donald Trump said Bush had "inspired generations of his fellow Americans to public service".
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For his part, Ukrainian President Petro Poroshenko warned that there is a threat of a full-blown war with Russian Federation . We lack not only the resources, but also the will to let our young people die fighting another country's young people.