House Speaker Paul Ryan and Senate leader Mitch McConnell, both Republicans, also spoke.
The change in tone is likely fueled Bush family assurances that the 41st President's funeral would be free of political tension and the anti-Trump sentiment that permeated McCain's funeral, the Washington Post reported.
The Wisconsin Republican was delivering remarks during a ceremony at the Capitol Rotunda where Bush will lie in state, an honor reserved for few.
According to a former White House official to Bush senior, President Trump was told months ago that he would be welcome at any funeral.
A military aircraft carrying Bush's remains arrived at Andrews Air Force Base outside Washington, DC, Monday afternoon, as the nation's capital prepared to honor the 41st president.
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Guterres called for a "huge increase in ambitions" during the two weeks of negotiations in Poland, adding "we can not afford to fail in Katowice".
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Pence said that the last correspondence his family had with the former president was a letter and photo that his son, USMC Lt. Michael Pence, received in August. An invitation-only funeral service is set for Wednesday at Washington National Cathedral.
"Above all, though, President George H.W. Bush was a good man who treated others with kindness and respect - regardless of their politics".
Sully is named after Chesley "Sully" Sullenberger, the former pilot who famously landed his disabled plane in New York's Hudson River in 2009 to save the lives of 155 people. The commemorations conclude on Thursday, when the casket will be flown back to Houston for a service at St. Martin's Episcopal Church and buried at his presidential library in College Station.
Sully worked for Bush over the summer after former First Lady Barbara Bush died. The number is a reference to Bush's place in the roster of America's presidents.