Trump: Why didn't protesters vote?

President Donald TrumpDonald John TrumpSenate GOP budget ignores Trump, cuts defense Trump says he'll nominate Stephen Moore to Fed White House: ISIS territory in Syria has been 100 percent eliminated MORE on Sunday raised questions about whether protesters who marched in Washington and around the nation a day earlier voted in the presidential election.

"Watched protests yesterday but was under the impression that we just had an election!" the president tweeted. 

"Why didn't these people vote? Celebs hurt cause badly."

“Peaceful protests are a hallmark of our democracy,” he said in a later tweet. “Even if I don't always agree, I recognize the rights of people to express their views.”

At least 3 million protesters on Saturday took to the streets of Washington, D.C. and cities across the world on the first full day of Trump's presidency, according to a review of official and unofficial estimates from the nation's largest cities.

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Large turnouts were reported in Boston, New York City, Chicago and Los Angeles as organizers for the main rally and march in Washington, D.C. grappled with a huge number of demonstrators.

Half a million people showed up at the National Mall and nearby streets for the Women's March on Washington.

At the event in Washington, D.C., a number of Democratic lawmakers and celebrities encouraged demonstrators to take action in the wake of a Trump presidency.

Feminist icon Gloria Steinem during the event called for Trump to unite the nation instead of divide it, saying that if the U.S. begins a registry of Muslims, then "we will all register as Muslims."

Sen. Bernie SandersBernard (Bernie) SandersDemocratic Socialists of America endorses Sanders for president Trump on 2020 Dems skipping AIPAC: 'I think they're anti-Jewish' The Hill's Morning Report — Washington readies for Mueller end game MORE (I-Vt.) tweeted in support of the marchers. Former Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonDemocratic Socialists of America endorses Sanders for president How to end the Electoral College and elect our next president by popular vote CNN town halls put network at center of Dem primary MORE also tweeted ahead of the march to thank the protesters.

--This report was updated at 9:38 a.m.