Erdogan also said he would like to talk about the issue by phone with the US ahead of two leaders' meeting in Japan.
Last week, Pentagon announced in a letter to Turkish Defence Minister Hulusi Akar that if Ankara does not drop the Russian S-400 missile defence system by July 31, the country would be blocked from purchasing F-35 fighter jets.
The Turkish President insisted that Ankara has already bought the Russian S-400 missile defence systems, adding it was a done deal.
Addressing the US plans to wind down Ankara's involvement in the F-35 fighter jets programme over the purchase, Erdogan stressed that Turkey was not only a client but also a production partner that invested over $1 billion in the project.
The US repeatedly warned it will cut off Ankara's purchase of F-35 fighter jets if the Turkish government goes ahead with plans to buy Russian S-400 air defence system, triggering a heated dispute between the two NATO allies.
Washington has already suspended deliveries of parts and services related to Turkey's receipt of the multi-million dollar jets.