The president of the NAACP on Wednesday urged a Senate committee not to confirm Sen. Jeff Sessions nomination as attorney general, citing “deep concerns” over his background protecting civil rights.

“We must face the reality that Sen. Sessions should not be our attorney general,” Cornell Brooks told the Senate Judiciary Committee during the second day of confirmation hearings for the Alabama Republican.

Brooks said the record of President-elect Donald Trump’s nominee of not protecting Americans’ voting rights was the most troublesome.

“Rather than condemning voter rights suppression, he and has condemned voter ID laws,” Brooks said.

Later, Sen. Cory Booker is expected to take the unprecedented step to testify against Sessions, a fellow senator.

Booker was criticized for violating the Senate’s rules of decorum and using his testimony as a political stepping stone.

Sen. Tom Cotton on Facebook accused Booker, who could be a 2020 presidential candidate, of a “disgraceful breach of custom.

“This hearing simply offers a platform for his presidential aspirations. Senator Booker is better than that, and he knows better,” Cotton, a Republican from Arkansas, wrote.