A New Jersey man who was trying to help build a “small army” of ISIS terrorists to wage jihad on the US was arrested Monday and hit with federal terror raps.

Nader Saadeh, 20, of Rutherford, is charged with conspiring to provide material support to the radical group. He had several alleged New York and New Jersey accomplices who have already been arrested — including his brother.

Saadeh, who espoused ISIS doctrine and attacks in online correspondence with his would-be collaborators, traveled to the Middle East in May to join the group, then ended up back in New Jersey, according to court papers.

The feds claim that Saadeh became part of a radicalized group of local men who plotted to join ISIS.

An informant revealed to investigators that Saadeh voiced sympathy for several high-profile terror attacks — including the Charlie Hebdo massacre and the killing of a Jordanian pilot.

The Jordanian national researched methods of entry into areas with an ISIS presence and regularly viewed pro-ISIS videos online, papers state.

He traveled on May 5 from JFK Airport to Amman, Jordan, where he was detained before eventually ending up back in New Jersey.

Saadeh’s radical fantasies apparently worried his overseas mother, who begged him to “not go anywhere if u love me” in a text message to her son.

Saadeh, who will be arraigned Monday in New Jersey federal court, faces up to 20 years in prison and a $250,000 fine.