Milwaukee County Sheriff David Clarke pushed back against President Obama's claim that improved race relations will be one of the legacies of his time in office.

"One of the things that I've consistently said as president is that I'm the president of all people. I am very proud that my presidency can help to galvanize and mobilize America on behalf of issues of racial disparity and racial injustice," Obama said in an NBC News interview.

Obama said he hopes that his successor, even if he or she is not African-American, will be "just as concerned" as he is about these issues.

Clarke said on "Hannity" that he believes the president is "hallucinating" if he thinks he has improved race relations in America

"Race relations have always been tenuous in America. Slavery and discrimination have left an ugly scar on the soul of America. But that scar has been healing over the years. President Obama came along with sandpaper, rubbed it raw, and then poured salt in it to inflame it for political gain. He doesn't believe that and neither does anybody else," he said.

Clarke argued that Obama has contributed to a false narrative that there is "pervasive" racism by American police officers against African-Americans. 

Geraldo Rivera said he thinks that Clarke's criticism is too "harsh," and that there is an "undeniable" fear among black mothers about their sons being harmed by police officers.

Clarke said those sorts of "anecdotal" claims are based on emotion, not on facts and evidence.

Rivera said he speaks from his experience within New York City's minority communities, but agreed that Obama has not been a "bridge between the black and blue communities."

Watch the debate above.

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