MADRID (Reuters) -Former U.S. Treasury Secretary Larry Summers has resigned from Santander's international advisory board he currently chaired, a Santander spokesperson said on Wednesday.

His resignation comes several days after the U.S. Congress released documents that showed Summers shared a close relationship with the late convicted sex offender Jeffrey Epstein.

Summers, also a former president of Harvard University, said on Monday he would step back from all public commitments, adding that the move was to allow him "to rebuild trust and repair relationships with the people closest to me."

He has been a member of Santander's international advisory board, which provides advice to the group in matters such as innovation, digital transformation, cybersecurity and new technologies, since 2016.

On Wednesday he said he had also resigned from the OpenAI board.