But then, Trump's foreign policy has been chaotic and unpredictable, and his special relationship with Erdogan - the President made a decision to pull back USA troops from Syria after a phone call with the Turkish strongman - could mean the Patriots and F-35s could still be sold to the North Atlantic Treaty Organisation ally. Turkey received the first S-400 in a July shipment despite USA concerns that the system's radar could be used to spy on U.S. military hardware.
"Turkey's acquisition of sophisticated Russian military equipment, such as the S-400, creates some very serious challenges for us and we are talking about it constantly", Trump told a joint news conference. He reportedly floated a $100 billion trade deal in the letter as well.
"Instead, we should suspend Turkey from North Atlantic Treaty Organisation for engaging in ethnic cleansing and other atrocities in Syria, prompting more than 180,000 civilians to flee".
The dispute over the competing air defence systems is a major component of the tension between the two countries. Already outraged by Turkey's incursion into northeast Syria following Trump's military withdrawal from the border, lawmakers have called on Trump to cancel the meeting. Sen.
Erdogan, on the other hand, believes Kurdish forces in Syria are an extension of a separatist Kurdish group that has been fighting inside Turkey since the 1980s.
So far, Turkey has refused to give up the defense system. Turkey considers these Kurdish fighters to be terrorists and says the USA should end its partnership with them.
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Trump en basant leur argumentaire sur les affirmations de responsables gouvernementaux en désaccord avec le président. Aujourd'hui, le soutien à l'enquête de la Chambre se situe à 53 % de l'opinion publique (44 % la désapprouvent).
He also said almost all lawmakers in Congress see the S-400 as being incompatible with America's F-35.
The letter cited Erdoğan being "closer" to Russian President Vladimir Putin, including purchasing the S-400 air-missile defense system instead of the F-35 fighter jets from the United States, and his taking other steps antithetical to USA interests.
Trump, at Wednesday's news conference, made no reference to that, hailing Turkey as a great North Atlantic Treaty Organisation partner.
The US-Turkish relationship has been under severe strain following Erdogan's ordering of an October offensive against US-allied Kurdish forces in northern Syria. "We are not going to throw it away lightly if there is a way forward", the official said.
The U.S. said that Turkey would be responsible for recapturing any fighters who escaped during the incursion into Syria.
"There has been a callous disregard for civilian lives, including attacks on residential areas", said Margaret Huang, executive director of Amnesty International USA.
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But there's a simple reason why President Trump will still warmly welcome Turkey's leader Tayyip Erdogan at the White House on Wednesday.he likes him. Mr. Trump said he had no time to watch a "minute" of the impeachment proceedings because he was too busy meeting with Erdogan.
A State Department official said Trump is not rewarding Erdogan with a White House visit but is conducting diplomacy.
In the Senate, two Democrats introduced legislation denouncing Turkey's targeting of journalists, political opponents, dissidents, minorities and others.
The citizens were carrying banners reading "Stop Terror PKK=PYD" and "PKK=YPG=PYD Terrorist Organizations".
Turkey has said it captured and detained several members of the family of the slain Daesh group leader, Abu Bakr Al Baghdadi, including one of his wives, his sister and a daughter.
In the afternoon, the president held a meeting with Erodgan, Senators Lindsey Graham, Tim Scott, Ted Cruz, Joni Ernst and Jim Risch.
WWII submarine found after being lost for 75 years
A missing World War II submarine has been found in Japanese waters, 75 years after it sank with 80 USA sailors on board. So when she first learned of the discovery, she felt a mixture of shock, disbelief, sadness and grief.