A lawyer for a group set up to help Donald Trump’s transition to the White House has accused special counsel Robert Mueller of unlawfully obtaining thousands of emails.
Kory Langhofer made the comments in a letter to congressional committees.
But a spokesperson for Mr Mueller said the “appropriate criminal process” had been followed.
Mr Mueller is investigating allegations of collusion between Mr Trump’s presidential campaign and Russia.
What’s the issue?
Mr Langhofer works for the Trump for America (TFA) group. It used the facilities, including email hosting, of a government agency, the General Services Administration (GSA), in the period between Donald Trump’s election in November 2016 and inauguration in January.
In his letter, Mr Langhofer, says GSA staff “unlawfully produced TFA’s private materials, including privileged communications, to the special counsel’s office”