OMAHA, Neb. (AP) — More elected officials are urging a Nebraska State Board of Education member to resign after derogatory comments about President Barack Obama appeared on his blog.

Four Omaha Board of Education members on Monday joined the list of those calling on Pat McPherson to step down. The board members said in a statement that “there is no place for racist commentary” in politics.

Others calling for his resignation include Nebraska Gov. Pete Ricketts and Republican U.S. Sen. Ben Sasse.

McPherson’s blog included repeated references to Obama as a “half breed.” McPherson has said he didn’t write the posts and disavowed them before removing them last week.

McPherson did not return calls from the newspaper Monday and said last week he would have no further comment.