Boston-area man pleads guilty to mailing letters laced with white powder to Trump's sons
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A Massachusetts man pleaded guilty on Wednesday to mailing threatening letters to Eric TrumpEric Frederick TrumpFive things we know about Dems' sprawling Trump probe Kushner to cooperate with Judiciary document requests Hispanic Caucus demands probe into Trump Organization hiring undocumented workers MORE and Donald Trump Jr.Donald (Don) John TrumpFox's Chris Wallace challenges Nadler on whether no more indictments means no 'criminal collusion' Nadler willing to go to Supreme Court to obtain Mueller report Five things we know about Dems' sprawling Trump probe MORE, as well as local law enforcement officials.

The Department of Justice (DOJ) announced that Daniel Frisiello, 25, pleaded guilty to 13 counts of mailing a threat to injure, and six counts of false information and hoaxes. He has been under house arrest since he was charged in March, and will be sentenced in January.

Frisiello, of Beverly, Mass., mailed a letter containing to white powder to Eric Trump in March 2016 that warned if his father, then a candidate for the Republican presidential nomination, did not drop out of the race, the next letter would not be fake, according to the DOJ.

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In February, Frisiello sent another threatening letter containing white powder to Donald TrumpDonald John TrumpHow to stand out in the crowd: Kirsten Gillibrand needs to find her niche Countdown clock is on for Mueller conclusions Omar: White supremacist attacks are rising because Trump publicly says 'Islam hates us' MORE Jr, criticizing the president's eldest son as an "awful, awful person."

Trump Jr. was not home at the time, and his then-wife opened the envelope. She began feeling ill and was taken to the hospital as a precaution. The substance was later deemed nonhazardous.

The DOJ said that in the roughly two years between letters to members of the Trump family, Frisiello sent letters to the head of law enforcement agencies in Connecticut and Rhode Island who were involved in an investigation into a Vermont man, Nathan Carman. Carman allegedly killed his own mother and grandfather.

Frisiello said those officials would end up "at the bottom of the sea" or with a "bullet in [his] brain" if they did not drop their investigation, according to the DOJ.