The 14th amendment of the consitution guarantees that "No state shall.... nor deny to any person within its jurisdiction the equal protection of the laws."
The practice of elective circumcision of girls is outlawed federally, but circumcision of boys is perfectly legal.
Routine circumcision is an elective cosmetic surgery, and serves no medically valid purpose, and is arguably harmful. This practice is harmful to both genders, but only girls are protected.
People argue that male circumcision is a "parent's choice", but it violates the child's right to ownership of his own body.
Enforce the 14th amendment. Protect all children equally from body modification. Outlaw all circumcision, regardless of gender.