U.S. President Donald Trump threatened a probe that could prompt fresh tariffs in response to the European Union fining Alphabet¡¯s Google over findings the company abused its dominance by giving its own ad exchanges a competitive advantage.

The president made his warning in a social media post Friday after the EU announced it was fining Google almost €3 billion ($3.5 billion) and ordering the search giant to stop favoring its own advertising technology services.

¡°This is on top of the many other Fines and Taxes that have been issued against Google and other American Tech Companies, in particular,¡± Trump posted on social media. ¡°Very unfair, and the American Taxpayer will not stand for it! As I have said before, my Administration will NOT allow these discriminatory actions to stand.¡±