The agency said it would provide more details in a press conference later. Acting U.S. Attorney Jack Smith says that if convicted of the federal charge, he faces at least 10 years in prison.
While missing, Cummins was charged with kidnapping and a misdemeanor of sexual contact with a minor.
The organization stated that Thomas was found "healthy and unharmed".
"As soon as she's ready for any help we can offer, we'll be there for her", said 22nd District Attorney General Brent Cooper.
Many have questioned if Elizabeth went willingly. We don't know what's gonna be involved yet.
It could take weeks to extradite Cummins, the Federal Bureau of Investigation said.
It came from a caller who told investigators that the 50-year-old Cummins and the teenager he is accused of abducting might be living in a remote cabin near Cecilville, California, a onetime mining town about 100 miles from the OR border.More news: Prosecutors, Judges Back Orlando State Attorney That Refuses To Apply Death Penalty
"We mobilized a nation during these 6 weeks. Here in California and Siskiyou County, CA, a state I've never even been to, you had concerned citizens who did the right thing, and so there are so many good people in this country", Whatley said.
Authorities arrested Cummins in a remote part of northern California on Thursday.
April 20 - Cummins was arrested in Northern California, and Thomas was found safe.
"And a couple of times he always kept her in the vehicle and he would be like 'she's asleep, ' you know, and I'm like, 'okay, '" Barry told KOBI.
April 3 - TBI confirmed photos from Nebraska police were not Cummins and Thomas. "She's loved by her friends, her family and the community of Columbia", the bureau's director, Mark Gwyn, said.
Officers ran down more than 1,500 leads and put in countless hours during the search for her, he said. "As we have said from the start, it only takes one tip and this is another example of the the public helping rescue a kidnapping victim".
Authorities said Thomas will return to Tennessee on a TBI aircraft.More news: Bulls beat Celtics again
Cummins and the teenager, Elizabeth Thomas, have been missing since March 13 when the pair fled Culleoka (they were facing an investigation into their supposed sexual relationship after a fellow student claimed they saw them kissing in an empty classroom). The wife, who works for the Maury County school system, said she had not seen her husband since March 13. The couple has two children together.
"This just feels like our prayers have been answered, and the lost sheep is home".
He said, "She is excited that they were found and nobody was hurt".
The 49-year-old woman who was married to her husband for 31 years is seeking alimony and attorney fees, according to the four-page suit.
"I will let the courts deal with the ramifications of what happened here."
A suspected kidnapping like this is a rarity in Columbia, said Mayor Dean Dickey.
"The longer it carries on, you seem to expect the worst", Dickey said.More news: New details on federal investigation into Fox News
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