This WSJ report says IRS is working on collecting $10.7 bill in taxes from Amgen for the shift of $14 billion in profits to its Puerto Rican subsidiary. Puerto Rico is considered a foreign country for US tax purposes, and by locating profits there Amgen paid much lower taxes than most companies. In 2013 this was effective tax rate of 3.5%. Now this is coming into careful scrutiny from the US government as president Biden plans to generate revenues to pay for the shift to renewable energy to combat climate change with COP26 commitments by the US, and to reduce pharmaceutical cost inflation for the US public. This is the idea behind the $369 billion Inflation Reduction Act of 2022, both a climate and a tax bill that is being passed in the US Congress.
This bill is the biggest climate change bill in history and yes it depends on revenues from fair taxation that has not happened till the Biden administration's resolute effort in this direction.