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On Monday, Clark released a statement 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.

In announcing her arrest, federal prosecutors said nothing about Muscara’s motive.

Muscara was due to make an initial appearance in federal court in Bangor Monday at 2:30 p.m. If convicted, she faces up to 10 years in prison and $250,000 fine.

It was not immediately clear whether she had an attorney.

The arrest comes a few days after a 55-year-old New York man was arrested for allegedly threatening to murder Minnesota Rep. Ilhan Omar.

\"PHOTO:
Michael Reynolds/EPA via Shutterstock
PHOTO: Democratic Representative from Minnesota Ilhan Omar attends a joint meeting of the Congress, on Capitol Hill in Washington, April 3, 2019.
>

Patrick W. Carlineo Jr. allegedly called one of the congresswoman's staffers on March 21 with a threat.

\"Do you work for the Muslim Brotherhood?\" Carlineo allegedly said in the call. \"Why are you working for her, she's a [expletive] terrorist. I’ll put a bullet in her [expletive] skull.”

Carlineo has a hearing in federal court on Wednesday. He, too, faces 10 years in prison or a $250,000 fine if convicted.

ABC News' Trish Turner contributed to this report.

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