Iowa Senate Majority Leader Mike Gronstal has reiterated his opposition to a gay marriage debate.

During an appearance on Iowa Public Television's Iowa Press, Gronstal promised he would block a proposed constitutional amendment banning gay marriage in Iowa from reaching the Senate floor.

“People's rights should not be put to a popular vote,” Gronstal, a Democrat from Council Bluffs, said. “We didn't put slavery to a vote of the people. We didn't put the right to go to a school in your neighborhood to a vote of the people of Iowa.”

Democrats in the Senate kept their 1-seat majority earlier this month when Democrat Liz Mathis won a special election.

Earlier this year, the Republican-controlled House approved the amendment that seeks to undo the Iowa Supreme Court's 2009 ruling that legalized gay marriage in the state.

Senate Minority Leader Jerry Behn called Gronstal's decision “outrageous.”

“We're just discussing should Iowans get a vote on it.” Behn said. “Absolutely, Iowans should get a vote on it. It's outrageous that he's going to say no.”