Washington (CNN) - GOP presidential contender Herman Cain walked back comments Sunday that he made a day earlier when he called for a deadly electric fence on the United States-Mexico border.
"That's a joke," Cain said on NBC's "Meet the Press." "I've also said America needs to get a sense of humor. That was a joke, OK."
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Cain made the fence comments Saturday at a Tennessee rally while kicking off his bus tour to promote his "9-9-9" tax plan.
Speaking to the crowd, Cain recalled a conversation he had on his conservative radio talk show with a caller who argued against building a fence to prevent illegal immigration.
But Cain said he fought back, telling the caller:
"When I'm in charge of the fence, we going to have a fence. It's going to be 20 feet high. It's going to have barbed wire on the top. It's going to be electrocuted, electrified," Cain said. "And there's going to be a sign on the other side that says it will kill you."
Cain, who's surged to the top of the Republican presidential field to join fellow front-runner Mitt Romney, said he was only kidding about the remark.
"That's not a serious plan," Cain said Sunday.
Cain's comment Sunday comes one day before he's set to meet with Sheriff Joe Arpaio, the high-profile Arizona law enforcement officer known for cracking down on illegal immigration. According to the sheriff's office, Monday will mark the second meeting for Cain and Arpaio in the last three months.
"I’m anxious to hear Herman Cain’s position on a variety of issues, directly from him and not through the prism of media interpretation,” Arpaio said in a statement.
In the interview Sunday, Cain went on to explain his immigration plan, which includes securing the border using a physical fence, new technology and, if needed, troops on the ground. He also argued for stronger enforcement of laws already in place and called for a tighter bureaucracy.
–CNN's Steve Brusk contributed to this report.