Ready or not, here he comes. At a concert on Friday, former Haitian presidential hopeful and musician Wyclef Jean fired back at one of his biggest critics, actor Sean Penn. Penn wrote an op-ed column for The Huffington Post criticizing the singer’s absence following the January earthquake in Haiti. “None among us felt or expressed anger toward it, but rather a universal sadness for his silence, as he is America's most admired cultural link to Haiti,” wrote Penn. Now, it’s Jean’s turn. While performing his 2004 song “President” at a New York concert last week, he sang: “I got a message for Sean Penn: Maybe he ain't see me in Haiti because he was too busy sniffing cocaine.” A rep for Penn contacted The Daily Beast with this response: “Mr. Jean is clearly unfamiliar with the physical demands put upon volunteers in Haiti. As aid workers there, the notion of depleting the body’s immune system through the use of illicit drugs is ludicrous. More specifically, J/P Haitian Relief Organization (JPHRO) has a ZERO tolerance policy for any and all illegal drugs. As the leader of this organization, Sean Penn has not only set this policy, but adheres to it. That Mr. Jean would make such a false accusation is reckless and saddening, but not surprising."