A Frederick County, Maryland, parent is pushing for an international school walkout on Thursday.

“Join parents across the United States, Canada, the UK, and globally to send a message that parents’ rights are civil rights by keeping their children out of school on September 14,” Tom Neumark wrote in a post on social media.

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He calls for an “Unteach” movement of parents to send a message that “parents are the primary educators of their children and should be respected.”

Neumark encourages parents to participate in activities that “qualify” as an excused absence, such as a vacation day.

The leader of this walkout push established the Frederick Classical Charter School in Maryland and has been a vocal opponent of “Policy 443” in Frederick County Public Schools. The policy describes transgender and gender nonconforming students as a protected class, meaning school staff do not have to disclose to parents their child’s gender status, transition, or use of a different name or pronoun.

In addition, the policy allows any student to access bathrooms and locker rooms corresponding with their preferred gender. A transgender student may also participate on sports teams according to their gender identity.

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Neumark told WMAL on Wednesday that parents oppose the “secret gender transitions” at schools.

His parental rights movement in Maryland is part of a growing trend in the Washington, D.C., suburbs, including Virginia’s Loudoun and Fairfax counties, that seeks to fight the growing gender identity policies in public schools.