Obama UN ambassador: I'm 'filled with optimism & determination' after McCain's funeral
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Former U.S. Ambassador to the United Nations (U.N.) Samantha PowerSamantha Jane PowerFormer US envoy Samantha Power: Trump finding 'new ways to compensate Putin for election interference' Former UN ambassador: Republicans have made a 'devil's bargain' to accept Trump Obama U.N. ambassador: Trump has 'endorsed ethnic cleansing' MORE said Saturday that Sen. John McCainJohn Sidney McCainEx-Rep. Scott Taylor to seek old Virginia seat Man acquitted over tweet offering 0 to killing an ICE agent Lessons of the Kamala Harris campaign MORE's (R-Ariz.) funeral filled her with "optimism & determination" for the future of the country.

In a tweet Saturday, Power wrote that the values championed by McCain, who died last week at age 81 from brain cancer, are "indomitable and enduring."

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"Just leaving DC after #McCainsFuneral and am filled with optimism & determination. These last months have been dark, but McCain never gave up & faced far worse," the Obama-era U.N. official wrote Saturday.

"The values he championed - enshrined in the grand American anthems sung for him today - are indomitable and enduring," she continued.

The Washington, D.C., funeral was attended by top members across the political spectrum, many of whom were colleagues and friends of McCain throughout his more than 30 years serving as an Arizona senator. 

Power's former boss was one of two former presidents to speak Saturday at McCain's funeral. President TrumpDonald John TrumpLawmakers release defense bill with parental leave-for-Space-Force deal House Democrats expected to unveil articles of impeachment Tuesday Houston police chief excoriates McConnell, Cornyn and Cruz on gun violence MORE was not invited to attend the service.

During his remarks, Obama appeared to rebuke "bombast" and politics of "phony controversies" in the current political climate. 

"So much of our politics, public life, public discourse can seem small and mean and petty, trafficking in bombast, and insult, and phony controversies, and manufactured outrage," Obama told the crowd at the Washington National Cathedral.

"It's the politics that pretends to be brave and tough but in fact is born of fear," he added. "John called on us to be bigger than that. He called on us to be better than that."

McCain's daughter Meghan McCain explicitly took aim at the president's rhetoric in her eulogy.

"America does not boast because she does not have need to. The America of John McCain has no need to be made great again, because America was always great," McCain said to applause.

Trump spent Saturday at his Virginia golf course after issuing several tweets in the morning attacking the FBI and Justice Department, as well as trade difficulties with Canada.