Former President Barack Obama Barack Hussein ObamaObama calls on Senate not to fill Ginsburg's vacancy until after election Senate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week 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.”

I’ve always drawn inspiration from what Dr. King called life’s most persistent and urgent question: "What are you doing for others?" 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. — Barack Obama (@BarackObama) January 21, 2019

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 Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE and Vice President Mike Pence Michael (Mike) Richard PenceEx-Pence aide: Trump spent 45 minutes of task force meeting 'going off on Tucker Carlson' instead of talking coronavirus Trump asked Chamber of Commerce to reconsider Democratic endorsements: report Controversial CDC guidelines were written by HHS officials, not scientists: report 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."

Today we celebrate Dr. Martin Luther King, Jr. 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. #MLKDay https://t.co/pEaVpCB8M4 — Donald J. Trump (@realDonaldTrump) January 21, 2019

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.