The Irishman publicly praised the president on Twitter, while Trump congratulated him for his win in UFC 246 on Saturday night.
Google Doodle celebrates Martin Luther King Jr. Day, which is the first federal holiday named after a modern private citizen.
Find out which mail services will run on MLK Day, a federal holiday celebrating Martin Luther King Jr.'s birthday.
Doris Miller received the Navy Cross for his heroic actions during the attack on Pearl Harbor, on December 7, 1941.
"Activism is inherently divisive," Ocasio-Cortez said.
"This is an insult to the American people that the president of the United States does not officially recognize or give any ceremony for Dr. King," Sharpton said at a breakfast to honor the civil rights leader.
"One of my favorite quotes from Dr. King was, 'Now is the time to make real the the promises of democracy,'" Pence said.
Martin Luther King Jr. wrote five books and delivered about 450 speeches a year.
Here's where to shop over the holiday weekend, both online and in-store.
People around the country were marching, celebrating, protesting and volunteering in honor of the civil rights leader.