Turkish President Recep Tayyip Erdogan ordered on Saturday his ministers to quit using the services of US consulting firm McKinsey.
Last month, Finance Minister Berat Albayrak, who is also Erdogan's son-in-law, announced that Turkey had decided to work with McKinsey as part of efforts to implement a new medium-term economic program.
This prompted a backlash from the opposition.
Leader of the main opposition Republican People's Party (CHP), Kemal Kilicdaroglu this week accused Erdogan of siding with US firms at a time when relations with Washington have been hit by the detention of a US pastor in Turkey and other issues.
McKinsey was not immediately available for comment.
Albayrak had defended the agreement with McKinsey earlier this week, saying anyone who did not want Turkey to work with McKinsey was “either ignorant or a traitor”.
On Saturday, Erdogan appeared to have scrapped the deal, however.
"This person (Kilicdaroglu) is trying to corner us by asking questions about a consultancy firm that has been paid in full to help our economic management," he told members of his ruling AK Party.
"In order to not give him that chance ... I told all my ministers to no longer receive consultancy from them (McKinsey)."
Later on Saturday, Kilicdaroglu said Erdogan had been forced to cancel the deal after failing to disclose the details of the agreement that he had asked for earlier in the week.
“I asked you 10 questions, told you to answer them. He read them but couldn’t handle it. He can’t answer and now he has been forced to cancel the deal,” Kilicdaroglu said.
Omer Celik, the spokesman for the ruling AK Party, told reporters at a party summit chaired by Erdogan that the president had told his party and ministers to receive consulting services from Turkish firms from now on.
