U.S. President Donald Trump on Friday blasted the European Union over what he called its illegal decision to fine Alphabet’s Google, saying Washington would launch a probe into the bloc’s “robbing” of American companies.

The European Commission on Thursday fined Google a total of €890 million ($1 billion) for flouting EU rules aimed at reining in the power of Big Tech.

“We will immediately initiate a 301 Investigation into the practice of “ROBBING” American Companies,” Trump said in a social media post, referring to Section 301 of the Trade Act of 1974.

“The European Union will pay a very big price for this illegal and highly unethical conduct,” he wrote.

(Reporting by David Ljunggren; editing by Susan Heavey)