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 TrumpJan. 6 organizers used burner phones to communicate with White House: report Mary Trump calls Donald Trump Jr. her 'stupidest' relative Eric Trump lawyer in New York attorney general's fraud case quits MORE and Donald Trump Jr.Don TrumpCourt orders release of some redacted passages of Mueller report How Trump uses fundraising emails to remain undisputed leader of the GOP Donald Trump Jr. joins Cameo 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 TrumpHillicon Valley — State Dept. employees targets of spyware Ohio Republican Party meeting ends abruptly over anti-DeWine protesters Jan. 6 panel faces new test as first witness pleads the Fifth 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.