Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleyFBI informant gathered years of evidence on Russian push for US nuclear fuel deals, including Uranium One, memos show Klobuchar taking over Franken's sexual assault bill Lawyer: Kushner is 'the hero' in campaign emails regarding Russia MORE (R-Iowa) says he needs to go back to the record to determine why he voted against Sonia Sotomayor's nomination to the appellate court in 1998.

Not until a reporter recently reminded him did Grassley realize he had voted against Sotomayor's nomination, the Iowa Republican told C-SPAN today.

"Evidently I was one of the 27 people that voted against her when she went on the Circuit," he said.

Grassley, who sits on the Judiciary Committee, said he'll go back and re-examine his stated reasons for opposing Sotomayor, but it shouldn't be taken as a sign that he'll necessarily vote against her this time around.

"And I don't want anybody to believe that I'm going to have that be a reason for me having my mind made up now," he added. "Because quite frankly, I'm going to have to go back and hopefully I gave a speech at the time, or there's something in the record of my rationale for the no vote at the time."