Giuliani reportedly said the remarks weren't racist because Obama's mother is white.
The papal visit will also include a trip to Washington, D.C. and to Philadelphia.
Racism was also to blame, the mayor said Monday at the Apollo Theater.
The class with Bill Yosses kicked off Citymeals-on-Wheels' September fundraising campaign.
President Obama gave the Harlem filmmaker the prestigious award at a White House ceremony this week.
A woman mailed an envelope of sugar to the police commissioner so he could analyze it, sources said.
The mayor-elect and 15 other mayors headed to Washington, D.C. on Friday to discuss economic issues.
In a statement, President Obama praised Bill de Blasio's message of "progressive change."
Elizabeth Gaynes won a White House award for her 29 years as head of the nonprofit Osborne Association.
Former President Bill Clinton dismissed talk that his wife would make a good mayor.
President Barack Obama will be back in New York Wednesday for a star-studded basketball event.
A fourth grader from the UES is heading to a White House dinner hosted by Michelle Obama.
The president will speak at Barnard College on Monday afternoon, then attend a fundraiser in Chelsea.
Mayor Michael Bloomberg said he would consider serving either party in the White House.
Carl Ballenas' students at Immaculate Conception in Jamaica Estates are competing for a $10K prize.
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