SAN FRANCISCO (CBS/AP) — A senior partner at a Silicon Valley venture capital firm said he was a loyal supporter of a woman who is now suing the company for sex discrimination.

Billionaire John Doerr took the witness stand for a second day on Wednesday in the lawsuit alleging women were denied chances to advance at Kleiner Perkins Caufield & Byers.

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The lawsuit was filed by Ellen Pao, who says she was denied a chance to advance because she is a woman and was fired in 2012 after she complained.

Under questioning by Kleiner Perkins’ attorney, Lynne Hermle, Doerr, a member of the firm’s management team, said he fought for Pao to stay and objected when other partners wanted to let her go in 2011.

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Doerr says he provided Pao with two coaches to help improve her skills.

Kleiner, Perkins, Caufield & Byers has a roster of senior partners that includes Al Gore and Colin Powell. The firm has billions with companies like Google and Amazon. Pao, a 42-year old Harvard Law School graduate, joined the firm in 2005 as Doerr’s chief of staff at Kleiner. She said she was called a “junior partner” and was told she would move into a full-time investing role in three years if she did a good job.

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