Former president Bill Clinton and his daughter Chelsea are urging New York lawmakers to approve a gay marriage bill.

On Thursday, Chelsea volunteered at a Manhattan phone bank urging voters to call their senator on the issue.

The former president offered his endorsement in a statement released Thursday by the gay rights group the Human Rights Campaign (HRC). Gay marriage, he said, would strengthen the nation.

“In the 21st century, I believe New York's welcome must include marriage equality,” he wrote.

“It's fantastic to have their support and they help amplify what we already know, which is that we have a super-majority of New Yorkers – 58 percent of New Yorkers support marriage equality in this state,” Brian Ellner of the HRC told NY1.

In 2009, Bill Clinton announced his support for gay marriage, saying he regretted signing into law the Defense of Marriage Act (DOMA), the law that bans federal agencies from recognizing the marriages of gay couples.

At a Tuesday event, Chelsea Clinton announced her support for the institution.

However, earlier this year, Secretary of State Hillary Clinton told gay glossy The Advocate that she had not changed her position on marriage equality.