Pfizer donated to his inauguration fund since they never thought he would actually win and were trying to buy favor with him at the last moment.

Trump was at war with big pharma since he took office:

Big Pharma loses $150 billion in executive order that will lower prescription drug costs by up to 30%

Trump’s Drug Pricing Czar Found With ‘Multiple Blunt Force Injuries,’ Ruled Suicide.

Federal judges have blocked Trump administration from requiring drug companies to list prices in TV Ads.

Trump pushing back the opioid crisis and big pharma lobbying.

Trump's four executive orders to lower drug prices