Not only that..

Both Tesla and BYD had negotiations to buy Sigma Lithium, the largest lithium mining company in Latam, where the world largest lithium reserves are..

Bolsonaro, and the right in general, is known to be anti-china and could help blocking BYD acquisition, that would favor Tesla that would be able to buy it cheaper then if he has to outbid BYD...

Cutting the Chinese access to latam lithium would also harm their expansion plans and slow their grow.. That would also favor Tesla as the Chinese is owning the market in many developing contries and are growing fast even in Europe..

Even in the US the Chinese EV are a problem to Tesla, to the point the government quadrupled the import taxes on Chinese EV..

I'm not across the current ownership breakdowns and state partnerships in South America (once upon a time I'd have quoted such things down to share percentages and layered subsidiary's) - the comment intrigued me as it's plausible there is some resource advantage to be gained by siding with one side of politics in Brazil, it's certainly the case that many large scale international dramas have at their core something that tracks back to resources and potential profits.

Controlling percentages can change, as can state restrictions on a number of conditions.

As I said it's not something I've dug into the details of.

Latin america have the world largest Lithium reserves, specially accross Argentina, Bolivia and Chile being the three largest and Brazil being the 7th..

The largest lithium mining company in the region is Sigma Lithium..

Tesla was negotiating to buy the Sigma Lithium but now the Chinese BYD is the favorite.. [0] [1]

China companies are currently owning the EV market in Brazil , and many other developing contries, and they have plans for both cars and batteries factories in Brazil, but they need access to lithium for that and so they are going for the lithium mining companies as well..

Musk not only need the lithium but he also want to block the grow of Chinese companies that are owning the market in many developing countries where Tesla is not present and are even growing fast in Europe..

Musk expect that a right wing government will align with him, and be in favor of blocking China and that would open the door for him to buy the mining companies instead..

[0] https://www.reuters.com/technology/tesla-considering-bid-sig...

[1] https://www.ft.com/content/3c55d69b-6932-4255-ad79-daeced372...