Story highlights Planned Parenthood will endorse Hillary Clinton for president on Sunday in New Hampshire

This will be the first time the group is endorsing in a presidential primary

San Gabriel, California (CNN) Planned Parenthood, the national women's health organization that Hillary Clinton often mentions on the campaign trial, will endorse the 2016 candidate for president on Sunday in New Hampshire.

This will be the first time the group, which has been mired in controversy since a series of videos by anti-abortion activists were released in 2015, will endorse in a presidential primary.

"As a lifelong Planned Parenthood supporter, I'm honored to have the endorsement of the Planned Parenthood Action Fund," Clinton said in response to the endorsement. "There has never been a more important election when it comes to women's health and reproductive rights -- and Planned Parenthood's patients, providers, and advocates across the country are a crucial line of defense against the dangerous agenda being advanced by every Republican candidate for president."

The group will make the endorsement official at what they are billing as their election kickoff event in Manchester, New Hampshire on Sunday. The group plans to spend at least $20 million in this election cycle, according to a press release.

The endorsement was somewhat of a forgone conclusion. Clinton regularly mentions Planned Parenthood on the campaign trail -- "I will defend a woman's right to choose," she says -- a line that draws applause from Democratic crowds.

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