The performer's remarks on Fox News' "Fox and Friends" show Monday resulted in a controversy and prompted sports broadcaster ESPN to cut his trademark "Are You Ready For Some Football?" opening song from its "Monday Night Football" broadcast.
During the Fox News segment, Williams made the comparison when talking about Obama playing golf on the same team with Republican House Speaker John Boehner during a June outing.
"I have always been very passionate about politics and sports and this time it got the best or worst of me," Williams said in a statement.
"The thought of the leaders of both parties jukin' and high fiven' on a golf course, while so many families are struggling to get by, simply made me boil over and make a dumb statement, and I am very sorry if it offended anyone.
"I would like to thank all my supporters. This was not written by some publicist," Williams wrote.
The Jewish Anti-Defamation League earlier Tuesday condemned Williams' comments on Fox, CNN reported.