Rick Santorum, the former Republican presidential candidate, pleaded for an end to an “assault on marriage” on Tuesday.

Speaking at the Republican National Convention taking place in Tampa, Santorum made veiled references to gay marriage with suggestions that the institution was under attack.

“The fact is that marriage is disappearing in places where government dependency is highest,” Santorum told the crowd. “Most single mothers do heroic work and an amazing job raising their children, but if America is going to succeed, we must stop the assault on marriage and the family.”

While he never explicitly mentioned gay nuptials, Santorum, who has a long and vocal record opposing gay rights and marriage in particular, said President Barack Obama, who in May became the first sitting president to endorse marriage equality, has enacted policies that “undermine the traditional family.” (The video is embedded on this page. Visit our video library for more videos.)

Earlier in the day, Mitt Romney became the party's official nominee for president and Republicans ratified the 2012 Republican Party platform, which supports a federal constitutional amendment defining marriage as a heterosexual union.

(Related: Pro-gay marriage conservatives blast GOP platform in full-page ad.)