The former teacher, who allegedly fled Tennessee with a teenager last year, does not want to plead guilty to his plea.
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The motion to change Tad Cummins' lawsuit was filed with the federal court on Thursday in Nashville.
He is charged with transporting a minor across national borders in order to prosecute and obstruct the judiciary.
On March 1
An Amber Alert was issued and police were over The country was looking for more than for a month, until it was found thousands of miles away on April 20 in a remote cabin in northern California. The teenager was "healthy and unharmed," the authorities said, and Cummins was taken into custody.
Thomas family lawyer Jason Whatley said in a statement Thursday, "The Thomas family is very relieved that Mr. Cummins has chosen to do the right thing by pleading guilty this as another step toward justice for Elizabeth. "
Cummins, who was dismissed from his job one day after missing him and Elizabeth allegedly Youth marriage online and specifically researches the age of consent, according to law enforcement officials.
Cummins planned her escape from the moment he was suspected of having an inappropriate relationship with the teenager, prosecutors claim. The prosecutors said Cummins was planning to reach the Mexican border and then go to countries further south.