Story highlights Trump Organization General Counsel Alan Garten confirmed the lawsuit but declined to disclose additional details

Sam Nunberg, who was fired late last summer, said he is the former aide who is being sued

(CNN) Donald Trump is suing a former campaign aide for $10 million, alleging that the ex-staffer breached a confidentiality agreement.

The lawsuit injects more drama to the Trump campaign as rumors swirl about the Republican presumptive nominee's vice presidential pick.

Sam Nunberg, who was fired late last summer from the campaign after racially charged Facebook posts of his surfaced, is the former aide being sued. Nunberg's lawyer, Andrew Miltenberg, told CNN Wednesday that Nunberg is being accused of "violating certain confidentiality provisions by talking about Donald Trump after he was no longer associated with the campaign."

"It has to do with information within the campaign and relationships between the various people within the campaign," Miltenberg said, adding that he would not elaborate further.

Miltenberg told CNN Wednesday that the Trump camp had asked a judge for the arbitration to be sealed.

Read More