Last month, Finance Minister Berat Albayrak announced that Turkey had decided to work with McKinsey as part of efforts to implement a new medium-term economic program, Reuters reported.
Kemal Kilicdaroglu, the leader of the main opposition Republican People’s Party (CHP), 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 evangelical pastor in Turkey and other issues.
“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,” Erdogan 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).”
McKinsey was not immediately available for comment.
The case of evangelical pastor Andrew Brunson, whose next court hearing is on Oct. 12, has plunged ties between Ankara and Washington into crisis, leading to US sanctions and tariffs which helped push Turkey's lira to record lows in August.
Brunson is charged with links to Kurdish militants and supporters of Fethullah Gulen, the cleric blamed by Turkey for a failed coup attempt in 2016. He has denied the charges and Washington has demanded his immediate release.
In a speech to a new session of parliament last week, Erdogan said Turkey was determined to fight, within legal and diplomatic frameworks, "this crooked understanding, which imposes sanctions using the excuse of a pastor who is tried due to his dark links with terror organizations."