But the investigation team led by special counsel Robert Mueller want to know if the Turkish government was behind the payments or if Mr Alptekin was bribed to hide the source of the money, according to the New York Times.
Special counsel Robert Mueller investigating Russian interference in the 2016 USA presidential elections has asked the White House for documents related to former National Security Advisor Michael Flynn, according to the New York Times. The newspaper said the document request was not a formal subpoena.
Flynn's consulting business Flynn Intel Group is alleged to have received $530,000 from a Turkish American businessman to run a campaign maligning an opponent of the Turkish government, said to have been behind last year's failed coup in Ankara.
Special counsel Robert Mueller's investigation into Russia's interference in the U.S. presidential election and the Trump campaign appears to be making headway as he sends a request to the White House for documents on former security adviser Michael Flynn. Mueller is attempting to determine whether the Turkish government was behind any of that money.
President Trump sacked FBI director James Comey in May after asking him to drop the investigation into Mr Flynn's links with Russian Federation.
Robert Mueller reportedly asked the White House for records on former national security adviser Michael Flynn.
After Flynn's dismissal, US President Donald Trump tried to get James B. Comey, the FBI director, to drop the investigation, Comey said.
Prosecutors have also asked during interviews about Flynn's speaking engagements for Russian companies, for which he was paid more than $65,000 in 2015, and about his company's clients - including work it may have done with the Japanese government.