The FBI has arrested and charged a 17-year-old from McKinney, Texas, who the agency alleges was plotting to assassinate Republican Rep. Keith Self at an event last Saturday. 

According to federal investigators, the juvenile also planned a terrorist attack in North Texas on behalf of ISIS. 

The FBI arrested the teen after he acquired a firearm, WFAA reported, citing federal law enforcement sources. Authorities haven't released the suspect's name. 

Self told WFAA in a statement that he served for 25 years in the military with the mindset that defending freedom is worth the sacrifice, and he believes elected leaders should govern with the same mindset. 

“Protecting our Constitutional Republic from radical Islam is getting messy," Self told the outlet. 

Self has been behind legislation aimed at Islamic extremism, including a non-binding resolution that denounces Sharia law and opposes its implementation within the United States. The congressman also sponsored legislation against Islamic extremism and Sharia law.