Consumer Financial Protection Bureau head Mick Mulvaney said Tuesday that he is examining a political appointee’s authorship of controversial blog posts on race and hate crimes in 2004.

Eric Blankenstein, a policy director overseeing the bureau’s main office for fair lending advocacy and education, is under scrutiny after the posts came to light. Sen. Sherrod Brown of Ohio, the Senate Banking Committee’s top Democrat, has already called for Blankenstein’s firing.