REUTERS

According to a federal complaint filed Sunday and obtained by Fox News, Joseph Gargiulo maintained a large stockpile of ammunition, weapons, and explosives material, which was discovered by investigators while executing a search of the 40-year-old's Holliston, Mass. home.

The FBI said it received a tip in July from an individual close to Gargiulo that he had acquired parts to make an AR-15 rifle, and that he was also in possession of a number of other weapons, including tasers, mace guns, and hunting knives, according to court documents.

The tip also stated Gargiulo had acquired thermite, a component used to make explosives. The complaint also states that Garguilo expressed his desire to kill President Obama on more than one occasion.

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Investigators also said that Gargiulo had allegedly expressed his desire to target Homeland Security officers and Muslims.

The federal complaint also states "Garguilo made a comment to the effect that when President Obama was on the golf course in Martha's Vineyard, Garguilo should have taken the opportunity to kill him."

Read alsoObama: IS weakening but still threatCourt documents paint the picture of a mentally disturbed individual, convinced the United States would soon be in a state of martial law. Gargiulo is alleged to have also abused steroids.

He has been charged with one count of being a prohibited person in possession of ammunition.

Officials said he had been the subject of an active restraining order that he painted a "substantial likelihood of immediate danger of abuse" of those weapons.