President Donald Trump was surrounded by dozens of girls and women Wednesday as he signed an executive order: Keeping Men Out of Women’s Sports.

“All of that ends today because with this executive order, the war on women’s sports is over,” Trump said.

The order is aimed at preventing transgender women from participating in female sporting events.

“This is the same Trump administration playbook that saw a series of recent executive orders all targeting transgender people,” NYCLU Assistant Legal Director Bobby Hodgson said.

The announcement comes on “National Girls and Women in Sports Day.”

“This is not a new law. It doesn’t have the force of law. In fact, it doesn’t even change the existing regulations that our federal agencies run under,” Hodgson said.

The executive order sets the Trump administration’s interpretation of Title IX, which established gender equity in school athletics.

“We welcome and champion every student at New York City Public Schools, and we believe that every student has the right to have their gender identity and gender expression recognized and respected. We continue to maintain our longstanding policy ensuring that every student can participate in sports in accordance with their gender identity,” a spokesperson for New York Public Schools said in a statement in part.

“The ideology that really is being spread right now is misinformation, is hate and is discrimination. Let’s call it for what it is,” Dr. David Kilmnick, president and founder of New York LGBT Network, said.

The executive order threatens schools’ bottom line if they do not comply.

“We’re putting every school receiving taxpayer dollars on notice that if you let men take over women’s sports teams or invade your locker rooms, you will be investigated for violations of Title IX and risk your federal funding. There will be no federal funding,” Trump said.

Kilmnick says his group is ready to mobilize.

“We have to be really intentional of uniting as a community, building local representation on our school boards, on our library boards, on our community boards,” Kilmnick said.

An Equal Right Amendment was recently enshrined into the state constitution, which bars discrimination on gender identity.

Hodgson says the challenges won’t only be on the state level, but also the national one.

“There will be challenges to all aspects of this Trump administration’s plan, and the law is really on our side,” Hodgson said.