Obama puts out call for service on MLK Day: ‘Make a positive impact on the world’
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Former President Barack ObamaBarack Hussein Obama4 ways Hillary looms over the 2020 race Obama goes viral after sporting black bomber jacket with '44' on sleeve at basketball game Obama attends UNC-Duke basketball game MORE on Monday urged Americans to “make a positive impact on the world” in honor of Martin Luther King Jr. Day.

“I’ve always drawn inspiration from what Dr. King called life’s most persistent and urgent question: ‘What are you doing for others?’” Obama tweeted. “Let’s honor his legacy by standing up for what is right in our communities and taking steps to make a positive impact on the world.”

The former president spent a number of his Martin Luther King Jr. Days in office volunteering at local organizations in Washington, D.C.

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His call for service comes as President TrumpDonald John TrumpAverage tax refunds down double-digits, IRS data shows White House warns Maduro as Venezuela orders partial closure of border with Colombia Trump administration directs 1,000 more troops to Mexican border MORE and Vice President Mike PenceMichael (Mike) Richard PenceUN nuclear watchdog: Iran maintains compliance with 2015 pact Pence going to Colombia to demand Maduro step down Grenell: Push to decriminalize homosexuality 'wildly supported' by both parties MORE visited the MLK Memorial in D.C.

The approximately two-minute visit was previously unannounced. In a tweet earlier Monday, Trump wrote that the U.S. celebrates King "for standing up for the self-evident truth Americans hold so dear, that no matter what the color of our skin or the place of our birth, we are all created equal by God."

Pence faced criticism from King’s son, Martin Luther King III, after he compared Trump to the civil rights icon in a pitch for the president’s immigration proposal.

“Martin Luther King Jr. was a bridge builder, not a wall builder,” Martin Luther King III said on Monday.