1. GM produce cars in mexico and import to US. Now the tariff is believed to be 20-25%.
2. TSLA sources 20% of its parts from Mexico , and the tariff also is believe to be 20-25%.
3. If Trump does not want to give EU car makers too much upper hand over US car makers, the US-Mexico tariff deal should lower the tariff on Car/parts importing from Mexico to at least15%, or lower. that would represents a big improvement from current level.
I hold both companes. Not a trade recommendation.