Federal authorities charged a woman Monday with sending a threatening letter to the home of Sen. Susan Collins Susan Margaret CollinsSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-Maine) in October.

An affidavit filed in U.S. District Court in Bangor and reviewed by The Associated Press says Suzanne Muscara mailed starch to the senator's husband, Thomas Daffron, with a letter that claimed to have been coated with "ricin residue."

The 37-year-old from Burlington, Maine, was reportedly arrested on Friday.

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The unsigned letter, which claimed Collins "betrayed the people of Maine," was sent shortly after the Republican senator's vote to confirm Supreme Court Justice Brett Kavanaugh Brett Michael KavanaughOvernight Health Care: US coronavirus deaths hit 200,000 | Ginsburg's death puts future of ObamaCare at risk | Federal panel delays vote on initial COVID-19 vaccine distribution Senate GOP sees early Supreme Court vote as political booster shot Trump says he'll make Supreme Court pick on Saturday MORE amid allegations of sexual assault.

Kavanaugh has denied the accusations.

Muscara, who is set to appear in court on Monday, faces up to 10 years in prison, according to the AP.

Collins's spokeswoman Annie Clark released a statement Monday commending authorities on the arrest.

"Senator Collins and Mr. Daffron greatly appreciate the extraordinary efforts made by state and federal law enforcement agencies which culminated in an arrest in this case,” she said.