Republican Sen. David Vitter vowed Monday to block President Obama’s nominee for Labor secretary, citing a past run-in with his state of Louisiana as well as the nominee’s role in the controversial voter intimidation case involving the New Black Panther Party.

The president on Monday tapped Justice Department official Thomas Perez for the Labor post. The candidate, though, was already being questioned over a newly released report that found he gave incomplete testimony on the decision to drop charges against members of the new Black Panthers.

“Thomas Perez’s record should be met with great suspicion by my colleagues for his spotty work related to the New Black Panther case, but Louisianians most certainly should have cause for concern about this nomination,” Vitter said in a statement.