Former Defense Secretary Jim Mattis , an investor in and board member of Elizabeth Holmes company Theranos , delivered damning testimony about her in court Wednesday.

Mattis, who served in two military roles under Presidents Barack Obama and George W. Bush before becoming Donald Trump s secretary of defense for two years, is the first high-profile witness to testify at Holmes trial, which commenced last month .

In his testimony, Mattis said Holmes misled him about Theranos blood-testing technology, lied about the Theranos machines being deployed in military operations and was firmly in charge of the company.

We were being deprived of fundamental issues, said Mattis, who invested $85,000 in the company and took home a $150,000 salary to serve on its board from 2013 to 2016.

There became a point when I didnt know what to believe about Theranos anymore. Looking back now, Im disappointed at the level of transparency from Ms. Holmes, Mattis said.