The US Securities and Exchange Commission on Thursday applied for a court order to force Elon Musk to testify in an ongoing probe related to his acquisition of Twitter and public disclosures he made in connection with the deal, according to court filings.

The filing Thursday in San Francisco federal court seeks a judge's order requiring Musk to testify, alleging "blatant refusal to comply" with an earlier SEC subpoena.

X, the company formerly known as Twitter, did not immediately respond to a request for comment.

-- This is a breaking news story and will be updated.