Feinstein has faced criticism from Republicans who argue she sat on the letter until the eleventh hour in an attempt to derail Kavanaugh's nomination. Feinstein counters that she was trying to protect Ford's privacy.

Feinstein's office is the second to say publicly that they are receiving threatening calls and emails. Her spokesman noted that most of the calls including threats have come from outside of California.

"My office has received some ugly voicemails, threats, terrible things said to my staff," Collins told a Maine radio station on Wednesday.