The lira´s fall had raised fears Turkey was on the verge of a fully-fledged economic crisis, especially in its banking system, that could spill over into Europe and other markets.
Qatar pledged on Wednesday 15 billion (Dh 55bn) of direct investment into Turkey, amid a diplomatic spat between Ankara and Washington that has triggered a Turkish currency crisis.
The lira firmed as far as 5.75 against the dollar on August 15 and stood at 6.1320 at 8:43 ET in a move initially triggered by the Turkish court decision on the Greek soldiers who faced espionage charges.
Erdogan's spokesman praised Qatari-Turkish relations on Twitter.More news: Saudi Arabia Clarifies: Cryptocurrency Trading IS Illegal
The bail-out followed talks in Ankara between the emir of Qatar, Sheikh Tamim bin Hamad Al-Thani, and Turkey's President Recep Tayyip Erdogan.
Additionally, Russian Foreign Minister Sergei Lavrov on Tuesday visited Ankara, where he said Moscow has been exploring for some time using national currencies to settle bilateral trade deals with Turkey and other countries.
"We have more that we're planning to do if they don't release him quickly", Mnuchin said.
Finance minister Berat Albayrak told more than 3,000 global investors and economists on a video conference that Turkey would emerge stronger from the crisis.
A court in the western Turkish city of Izmir rejected a new appeal to free Brunson on Wednesday, the state television TRT reported.More news: Possible Drug Identified In Demi Lovato's Overdose
In his televised speech yesterday, Erdogan vowed that Turkey will "boycott United States electronic goods".
"Turkey has alternatives", he said.
President Erdogan said earlier this week that Turkey should not "give in to the enemy" by investing in foreign currencies.
Erdogan spoke on the phone with German Chancellor Angela Merkel on Wednesday, the Turkish presidency said while he is due to speak with French President Emmanuel Macron on Thursday.
The United States was the fourth largest source of imports to Turkey past year, accounting for $12-billion of imports, according to International Monetary Fund statistics.
Brunson, a Christian pastor from North Carolina who has lived in Turkey for more than two decades, was indicted on charges of helping the Gülenist Terror Group (FETÖ), which is responsible for the failed 2016 coup, as well as for supporting the PKK.More news: Marlins hit Ronald Acuna to spark fight in first inning
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