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 PowerObama U.N. ambassador: Trump has 'endorsed ethnic cleansing' Former UN envoy Samantha Power doesn't rule out run for Warren's Senate seat We've lost sight of the real scandal MORE said Saturday that Sen. John McCainJohn Sidney McCainLawmakers toast Greta Van Susteren's new show Meghan McCain: It's 'breaking my heart' Warren is leading Biden in the polls The Hill's 12:30 Report: Video depicting Trump killing media, critics draws backlash 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 TrumpDemocratic senator rips Trump's 'let them fight' remarks: 'Enough is enough' Warren warns Facebook may help reelect Trump 'and profit off of it' Trump touts Turkey cease-fire: 'Sometimes you have to let them fight' 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.