Bob Schieffer on Donald Trump's Obama Comments: 'This Is an Ugly Strain of Racism'

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Donald Trump

Trump, who has questioned the president's birth certificate, is now trying to raise doubts about Obama's grades.

Donald Trump has yet another high-profile person speaking out against him.

CBS News' Face the Nation host Bob Schieffer appeared on CBS Evening News on Wednesday and criticized the potential contender for the Republican presidential nomination for his recent comments about President Obama.

Trump has angered many celebrities -- including Whoopi Goldberg, Robert De Niro and Jerry Seinfeld -- by raising doubts about Obama's birth certificate, which the White House released Wednesday. (Trump took full credit for Obama releasing the document.)

Trump's latest attack on Obama concerns the president's grades. He recently questioned whether they were high enough for him to get accepted into Columbia University and Harvard Law School.

"I have friends who have smart sons with great marks, great boards, great everything and they can’t get into Harvard," Trump said Tuesday. "We don’t know a thing about this guy. There are a lot of questions that are unanswered about our president."

On Wednesday, Schieffer shared his thoughts about Trump's comments.

"That's just code for saying he got into law school because he's black," Schieffer said on CBS Evening News, as picked up by TMZ. "This is an ugly strain of racism that's running through this whole thing."