Tesla Chief Executive Elon Musk's brother, Kimbal Musk, who is a Tesla board member, sold 27 million worth of Tesla stock on Thursday, according to regulatory filings. That comes as TSLA stock has retreated in recent days to a critical juncture.

Though Tesla’s shares doubled over the past 12 months, they’ve had a tough run since the inauguration. Investors are waiting to see if Elon Musk can keep the company’s charmed run going.

In many ways, these have been tough days for Tesla. Falling sales. Squeezed profit margins. Proposed changes in US government policy that could cost the company billions.

Investors are looking for evidence Musk’s politics are hurting Tesla. It’s hard to find, but California might be turning against Musk—slowly.