Sen. Marco Rubio (R-FL) may have damaged his credibility with creationists on Wednesday when he reversed course and declared that science proved “definitively” the the Earth was “at least 4.5 billion years old.”

The Florida Republican had recently suggested to GQ magazine that the Earth could have been “created in 7 days” but he wasn’t sure because “I’m not a scientist, man.”

But in an interview with Politico’s Mike Allen on Wednesday, Rubio said he was just trying to give the same answer that President Barack Obama gave in 2007.