The Girl Scouts of the USA have accused Boy Scouts of America of carrying out a "covert campaign to recruit girls into programs run by the Boy Scouts" in hopes of appealing to millennial parents and bolstering their declining membership, according to a letter they sent the Boy Scouts board on Monday.

The strongly worded letter — obtained by BuzzFeed News — alleged that BSA was "surreptitiously testing the appeal of a girls’ offering to millennial parents."

It also accused BSA leaders of making "disparaging and untrue remarks" about Girl Scout programming at "family meetings" outlining their proposed programs for girls.

A Girl Scouts spokesperson confirmed that Kathy Hopinkah Hannan, GSUSA's national president sent the letter to BSA's national president, Randall Stephenson, and the entire BSA board.

"Through various means we have learned that BSA is very seriously considering opening their programs to girls and we have made repeated efforts to engage with them and talk about the implications," the spokesperson told BuzzFeed News on Tuesday.

"It's a potentially dangerous and bad idea," the spokesperson said, citing research supporting "single gender programming" which says that girls learn best in an all-girls environment when it comes to scouting.

The spokesperson or the letter did not specify what BSA's proposed programs for girls were.

Effie Delimarkos, a BSA spokesperson, told BuzzFeed News that no decisions had been made regarding the girls programs and that no such programs had been implemented so far.

"Based on numerous requests from families, the Boy Scouts has been exploring the benefits of bringing Scouting to every member of the family – boys and girls," Delimarkos said in a statement. "No decisions have been made."