Andrew Left's defense played offense during his securities fraud trial on Friday, pressing a federal official on why the government targeted him rather than the company he accused of fraud. The prominent short-seller, known for bets on stocks like GameStop, faces accusations of market manipulation and deceiving everyday investors, allegedly earning over $20 million in the process.

At the heart of the case are Left's critical reports about Namaste Technologies, a Canadian cannabis company traded over the counter in the US under the ticker NXTTF. Left, through his firm Citron Research, published tweets and reports accusing Namaste of fraud in the fall of 2018. His defense contends that he was right about the company.

Left's lawyer suggested the government went after him for being a "whistleblower of the fraud." The defense argues that the short-seller shared his honest opinions, not misleading statements. The trial is ongoing in Los Angeles.

If convicted, Left faces significant legal and financial penalties. The outcome could have broader implications for how short-sellers communicate about target companies, potentially chilling critical research in the market.

The case tests the boundary between legitimate short selling and illegal market manipulation. A verdict is expected in the coming weeks.