The Air Force veteran who federal authorities say tried to join ISIS has pleaded not guilty to terror charges.

Tairod Nathan Webster Pugh, of Asbury Park, N.J., was arrested Jan. 16 before he could follow through on his plan to travel to Syria. 

Pugh, a 47-year-old American citizen, served at least four years in the Air Force as a mechanic before working for several companies, including in the Middle East. 

Shepard Smith reported today that Pugh was specially trained in weapons systems and was allegedly hoping to help ISIS. He wanted to travel from Egypt to Turkey and then cross into Syria, but he was stopped by Turkish authorities at the border, Smith said.

Smith said that investigators found evidence on his laptop and a letter that he wrote to his wife detailing that "he would use his talents and skills to defend the Islamic State."  

Judge Andrew Napolitano weighed in on "Shepard Smith Reporting" stating that this is the first time the FBI has arrested someone who did not live in the United States. 

"The government's argument is that ISIS is such a terrible threat to the United States," Napolitano said. "The United States of America has what's called extraterritorial jurisdiction. A fancy phrase for, we can arrest anybody, anywhere on the planet if we think they're going to eventually harm us."

Napolitano added that he thinks "the government is going overboard in its effort to give us the impression it wants to keep us safe by stopping people from even getting to ISIS."

Watch more in the "Shepard Smith Reporting" clip above.

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