Attorney General Eric Holder said Tuesday he opposes a new photo ID requirement in Texas elections because it would be harmful to minority voters.

In remarks to the NAACP in Houston, the attorney general said the Justice Department "will not allow political pretexts to disenfranchise American citizens of their most precious right."

Under the law passed in Texas, Holder said that "many of those without IDs would have to travel great distances to get them – and some would struggle to pay for the documents they might need to obtain them."

"We call those poll taxes," Holder added spontaneously, drawing applause as he moved away from the original text of his speech with a reference to a fee used in some Southern states after slavery's abolition to disenfranchise black people.

The 24th amendment to the constitution made that type of tax illegal.