(CNN) House Financial Services Chair Maxine Waters says her committee is in talks with Treasury Secretary Steven Mnuchin to bring him in to testify on the lifting of Russia sanctions on companies connected to Russian oligarch Oleg Deripaska.

Waters said Wednesday that Treasury has not responded to a request for documents tied to the sanctions relief, but she hoped that she would be able to have Mnuchin appear before her committee soon.

"The delisting of Deripaska was never really debated, so we're going to go after that as soon as we can get Mnuchin in," Waters told reporters. "What we're going to do is we're going to get Mr. Mnuchin into the committee and ask him real pointed questions about delisting."

A Treasury spokesperson could not be immediately reached for comment.

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