Allegations that former National Security Adviser Michael Flynn was paid by the Turkish government during the waning days of the 2016 presidential campaign are being investigated by Special Counsel Robert Mueller, who has requested documents regarding Flynn from the White House.
Flynn's business, Flynn Intel Group, worked with a Turkish-American businessman who paid the company $530,000 to "discredit an opponent of the Turkish government who has been accused of orchestrating last year’s failed coup in the country." Mueller is attempting to determine whether the Turkish government was behind any of that money.
The documents were not subpoenaed, simply requested, but Trump's special counsel, Ty Cobb, said in a statement to The Hill:
"The White House will not be discussing any specific communications with the Special Counsel out of respect for the Special Counsel and his process. Beyond that, as I have stressed repeatedly, we continue to fully cooperate with the Special Counsel."
Rep. Adam Schiff (D-CA), the ranking Democrat on the House Intelligence Committee, said Sunday his committee is also looking into Flynn's financial connections with Turkey and into payments made to him by RT, a Russian government-backed network.