The top United States diplomat in Turkey has called for the cases against an American pastor and others held in Turkey to be resolved "without delay" and in a "fair and transparent manner".
Turkey and Qatar have traditionally maintained good ties and Ankara stood by Doha after Saudi Arabia and other Arab states severed diplomatic, trade and travel ties with Qatar a year ago, accusing it of financing terrorism - a charge Doha denies.
The country's finance minister - who is also Mr Erdogan's son-in-law - will seek to reassure around 1000 global investors in a teleconference scheduled for Thursday.
Turkey's Vice President Fuat Oktay wrote on Twitter that the doubling of tariffs was done "under the principle of reciprocity", in response to America's "conscious attacks on our economy".
Analysts also said the political cost of the investment remained to be seen, given that Qatar is also a USA ally and dependent on Washington for both military and political protection.
The lira has lost almost 40 percent of its value against the dollar this year, driven by worries over Erdogan's growing influence on the economy and his refusal to raise interest rates despite high inflation.
On August 10, the USA president said he had ordered that U.S. tariffs on Turkish aluminum and steel imports be doubled to 20 percent and 50 percent, respectively.
He is scheduled to appear before a court in October for his third hearing after the court rejected an appeal for his release in a July 18 hearing. The Turkish lira has plunged as each country seeks to punish the other with sanctions and tariffs.
Ankara has imposed additional tariffs on US products, including rice, cars, alcohol, coal, and cosmetics, according to the decision announced in Turkey's official journal that publishes legislative and executive actions.
White House National Security Adviser John Bolton met with Turkey's ambassador to the U.S., Serdar Kilic, in Washington yesterday to discuss the potential release of Brunson.
JP Morgan said moves by Turkish authorities showed they were committed to stabilizing the currency with technical measures such as restricting foreign exchange swaps and cancelling repo auctions to push up the weighted average cost of funding.
Turkey's currency, the lira, bounced back sharply Wednesday morning, falling back below six per dollar.
As the feud between the US administration and Turkey deepens, Turkish officials announced Wednesday they will increase tariffs on certain American imports.
Trump has repeatedly asked for Brunson's release, while Ankara said the decision was up to the court.
Erdogan says Turkey is the target of an economic war and has made repeated calls for Turks to sell their dollars and euros to shore up the national currency.
"The US is our major trade partner but it's not the only one", Pekcan, the trade minister, was quoted as saying by the official Anadolu news agency. Brunson's lawyer told Reuters that the appeal could be heard sooner that the usual three to seven days.
Brunson, who is under house arrest, faces 35 years in prison if convicted. On Tuesday, he said Turkey would boycott US electronic products.
A court meanwhile rejected an appeal for the release of American pastor Andrew Brunson - whose detention for nearly two years sparked the crisis - leaving no immediate solution to the Turkey-US row in sight.