Sanders was depicted in an unflattering drawing about Ivanka Trump closing her fashion line.
"I drew pictures like this. Any other person of this age drew drawings like this. It's nothing to get expelled from school for," the boy's father said.
"The painting is not very inspired—high school students have doodled better artworks during trig class."
A previous drawing by Trump sold in July for more than $29,000.
The Charlie Hebdo shooting highlighted the threats faced by editorial cartoonists, according to a new report.
An original ink drawing by E.H. Shepard sold at auction in London for nearly $500,000.