New York attorney general Eric Schneiderman declared Tuesday that daily fantasy sports constitutes illegal gambling in his state and sent game operators DraftKings and FanDuel cease-and-desist notice.

"Our review concludes that DraftKings'/FanDuel's operations constitute illegal gambling under New York law," Schneiderman wrote in the letter, obtained by ESPN's David Purdum and Darren Rovell, and ABC News.

FaDuel was quick to respond."Fantasy sports is a game of skill and legal under New York State law," FanDuel said in a statement. "This is a politician telling hundreds of thousands of New Yorkers they are not allowed to play a game they love and share with friends, family, coworkers and players across the country. The game has been played -- legally -- in New York for years and years, but after the Attorney General realized he could now get himself some press coverage, he decided a game that has been around for a long, long time is suddenly now not legal."

It will be interesting to see how long this legal battle lasts, FanDuel is based out of New York City, and both companies also want to protect the New York customer base. According to i Eilers Research, New York has the highest number of daily fantasy participants of any state.