ATLANTA -- Martin Luther King Jr.'s children and the pastor of an Atlanta church where he preached decried disparaging remarks    President Trump is said to have made about African countries, while protests between Haitian immigrants and Trump supporters broke out near the president's Florida resort Monday, the official federal holiday honoring King.

At gatherings across the nation, activists, residents and teachers honored the late civil rights leader on what would have been his 89th birthday and ahead of the 50th anniversary of his assassination in Memphis, Tennessee. In Oklahoma, the Cherokee Nation marked Martin Luther King Jr. Day with events aimed at coming to terms with its own history of slavery and by welcoming descendants of former slaves into the tribe.

Mr. Trump marked his first King holiday as president buffeted by claims that during a meeting with senators on immigration last week, he used a vulgarity to describe African countries and questioned the need to allow more Haitians into the U.S. He also is said to have asked why the country couldn't have more immigrants from nations like Norway.

In Washington, King's eldest son, Martin Luther King III, criticized Mr. Trump, saying, "When a president insists that our nation needs more citizens from white states like Norway, I don't even think we need to spend any time even talking about what it says and what it is."

He added, "We got to find a way to work on this man's heart."

In Atlanta, King's daughter, the Rev. Bernice King, told hundreds of people who packed the pews of the Ebenezer Baptist Church that they "cannot allow the nations of the world to embrace the words that come from our president as a reflection of the true spirit of America."

"We are one people, one nation, one blood, one destiny. ... All of civilization and humanity originated from the soils of Africa," Bernice King said. "Our collective voice in this hour must always be louder than the one who sometimes does not reflect the legacy of my father."

Church pastor the Rev. Raphael Warnock also took issue with Mr. Trump's campaign slogan to "Make America Great Again."

Warnock said he thinks America "is already great ... in large measure because of Africa and African people."

Continue reading at CBSNews.com.