As police searched the house, McNulty allegedly told his brother, "No matter what, they are going to find something illegal," according to a criminal complaint.
"I've downloaded some extreme stuff, but I always thought they were adults," he allegedly added, according to the complaint.
McNulty was charged with two counts of sexual abuse of children and one count of criminal use of a communication facility. He was released on $10,000 bail and awaits a preliminary hearing scheduled for next week. Attempts to reach him for comment were unsuccessful.
In an unrelated case, a Pottstown man, Thomas Matthews Jr., was arrested Tuesday on 15 counts of possession of child pornography after agents said they found online files containing pornographic images of children and traced them to Matthews' computer.
Matthews, 27, was also charged with five counts of distribution of child pornography and one count of criminal use of a communication facility. He was being held in the Montgomery County prison with bail set at $50,000. His preliminary hearing in Montgomery County Court was scheduled for next week.
Kane used part of a $4.3 million increase in state appropriations to fund an expansion of her office's child predator section last year, including renovations to the section's command center and the hiring of several agents and lawyers.
The section has made 124 arrests since 2013, she said.