Facebook CEO Mark Zuckerberg has refused a request from the U.K.s Parliament to directly answer questions about the recent Cambridge Analytica data scandal , with the company offering to send a senior deputy instead.

In a letter shared by Member of Parliament Damian Collins on Tuesday , a Facebook official offered either Chief Technology Officer Mike Schroepfer or Chief Product Officer Chris Cox.

The letter did not state a reason for Zuckerbergs decision not to attend. A Facebook spokesperson reached by HuffPost via email on Tuesday did not elaborate on why the CEO will not appear.

Both Chris Cox and Mike Schroepfer report directly to Mr. Zuckerberg and are among the longest serving senior representatives in Facebooks 15 year history, reads the letter signed by Facebook UKs head of public policy, Rebecca Stimson. Both of them have extensive expertise in these issues and are well placed to answer the Committees questions on these complex subjects.