Peterson was one of two Democrats to sign onto the amicus brief.
The 19-year-old has been charged with several offenses.
A 19-year-old man is being held on terroristic threats, assault and public nuisance charges.
It's still higher than it was in 2015, but significantly lower than historic levels.
Clinics face losing their federal funding if they continue to refer abortion patients.
The bill would have forced doctors to ask abortion-seeking patients if they want to see an ultrasound.