Obama cracks jokes about his birth certificate at Congressional Black Caucus gala

U.S. President Barack Obama joked that there's an extra spring in his step now that the "whole birther thing is over."

Hillary Clinton honoured at event for being 1st woman nominated by major party to run for president

President Barack Obama speaks at the Congressional Black Caucus Foundation's 46th Annual Legislative Conference Phoenix Awards Dinner, Saturday, Sept. 17, 2016, in Washington. (Pablo Martinez Monsivais/Associated Press)

U.S. President Barack Obama joked that there's an extra spring in his step now that the "whole birther thing is over."

Obama was speaking at an annual dinner for the Congressional Black Caucus Foundation, which both he and Democratic presidential candidate Hillary Clinton attended.

The dinner comes a day after Republican presidential candidate Donald Trump reversed himself on his long-held and false view that Obama was not born in the United States.

With an air of sarcasm, Obama says that ISIS, North Korea, poverty, climate change — none of those things weighed on his mind like the validity of his birth certificate.

The president says the end of talk about where he was born will be a boost for him in the home stretch of his administration, and adds: "In other breaking news, the world is round."

Clinton also referenced the birther movement while praising Obama. 

"Mr. President, not only do we know you are an American, you are a great American."

Clinton was honoured at the Saturday night dinner for becoming the first woman to receive the presidential nomination of a major party.