The Senate confirmed a nominee from President Obama on Tuesday to serve on the Privacy and Civil Liberties Oversight Board.

In a 53-45 vote, David Medine was confirmed to serve as chairman of the Privacy and Civil Liberties Oversight Board. The vote split down party lines, with Democrats supporting Medine and Republicans opposing his nomination. Sens. John RockefellerJohn (Jay) Davison RockefellerBottom Line World Health Day: It's time to fight preventable disease Lobbying World MORE (D-W.Va.) and Frank Lautenberg (D-N.J.) missed the vote.

Sen. Chuck GrassleyChuck GrassleyBiden's program for migrant children doesn't go far enough The Hill's Morning Report - Presented by Facebook - Biden support, gas tax questions remain on infrastructure 64 percent of Iowans say 'time for someone else' to hold Grassley's Senate seat: poll MORE (R-Iowa) said he opposed Medine’s nomination because he wasn’t forthcoming with answers during his confirmation hearing in the Senate Judiciary Committee. Grassley said he asked Medine questions about his views on the Patriot Act and military force against terrorism but that Medine gave evasive answers.

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“Unfortunately, the responses I received failed to provide his views,” Grassley said ahead of the vote on Tuesday. “Very simply, when people are called to testify before Congress they should provide their views.”

Grassley said he didn’t trust that Medine could make the right decisions on “critical national security laws” that the board oversees. Grassley pointed out the Medine received a party-line vote in the Judiciary Committee, where Grassley serves as the ranking member.

“I fear that a nomination that is as polarizing as this could cloud the judgment of the board,” Grassley said.