Minnesota Senator Al Franken has renewed calls for passage of a federal anti-gay bullying bill after the death of Lance Lundsten over the weekend.

Lundsten was an 18-year-old openly gay student at Jefferson High School in Alexandria. He died on Saturday night after being transported to the Douglas County Hospital by emergency services.

The Douglas County Sheriff's Office told local ABC affiliate KSAX that Lundsten took his own life. Lundsten's father, however, denies his son committed suicide.

On Facebook, several students say the teen was bullied at school, which they fear could have led to his death.

“My heart goes out to Lance's family, and friends and loved ones,” Franken said. “It's a tragic event, not only for them, but for the school, and the Alexandria community and really for us all.”

“LGBT kids really do need [more] protection. They're two or three times more likely than straight kids to get bullied. Nine in ten LGBT students said they've been bullied or harassed and almost two-thirds say they don't feel safe in school.”

Franken renewed calls for Congress to pass the Student Non-Discrimination Act (SDNA), a bill which would outlaw discrimination against students on the basis of sexual orientation and gender identity (transgender protections).

Lundsten's funeral is set for Tuesday evening.