BRASILIA, April 8 (Reuters) - Brazil's Supreme Court

Chief Justice said on Monday that every company operating in the

country is "subject to the constitution," after one of the

court's judges opened an inquiry into social media platform X's

owner Elon Musk.

Chief Justice Luis Roberto Barroso said in a statement that

court decisions may be subject to appeal, but never deliberate

non-compliance, after Musk challenged a court decision ordering

X, formerly known as Twitter, to block certain accounts.

Barroso did not mention X or any other company by name.

Musk's remarks prompted Supreme Court Justice Alexandre de

Moraes to open an inquiry into the billionaire on Sunday.