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In an interview with CNN on Friday, Snowe said she no longer supports the Defense of Marriage Act, which defines marriage as between a man and a woman. Snowe also said she supports a law passed by her state's legislature that legalizes same-sex marriage, according to CNN.

Snowe's shift follows announcements by a number of senators that they now support same-sex marriage. Snowe said there has been a "sea change in society's whole attitude" on same-sex marriage and that government should be "responsive to those changes."

"The time has come," Snowe told CNN. "I think what we're seeing is, I think, changing societal conventions, that ultimately you see the transformation of society's gradual thinking and evolving on issues. I think we're seeing those sea changes on this particular question."

Earlier on Friday, Democratic Sens. Heidi HeitkampHeidi HeitkampHeitkamp is Trump's top choice for Agriculture secretary: report What gun groups want from Trump Senate passes stopgap funding bill, averting shutdown MORE (N.D.) and Joe DonnellyJoe DonnellyOvernight Energy: Fight over miners' benefits risks shutdown | Flint aid crosses finish line in House House approves funding bill, but fate in Senate unclear Messer eyes challenging Donnelly for Indiana Senate seat MORE (Ind.) announced support for same sex marriage. Recently 13 senators — 11 Democrats and two Republicans — have announced their support for same-sex marriage.