The suspended boss of data firm Cambridge Analytica has refused to reappear before a parliamentary inquiry into fake news.
The Digital, Culture, Media and Sport committee (DCMS) had asked the company's CEO, Alexander Nix, to appear on Wednesday to address "inconsistencies" in his earlier evidence.
But Mr Nix said he is unable to do so because he is now being investigated by the Information Commissioner.
News of his non-appearance emerged as former Cambridge Analytica employee Brittany Kaiser gave evidence before the DCMS committee on Tuesday.
"We will be discussing this with the information commissioner on Thursday but it's certainly the intention of the committee to take this further and consider issuing a summons for Mr Nix to appear on a named day at some point in the future," chairman Damian Collins MP told the hearing.
Investigators from the data watchdog spent nearly seven hours last month searching the London offices of Cambridge Analytica.
Mr Nix has been suspended by the controversial consultancy, which is at the centre of a dispute over the harvesting of personal Facebook data.
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"We have written to Mr Nix to invite him to be interviewed by our investigators," said a spokesperson for the Information Commissioner's Office.
"Our investigation is looking at whether criminal and civil offences have been committed under the Data Protection Act," the spokesperson added.