Last week, the Tánaiste and Foreign Affairs Minister Simon Coveney said: "We're working on it, we have assistance from Defence Forces personnel, with our team in the embassy in Turkey, and they're working with the Turkish authorities on this case, and I don't think it's helpful to speculate on the back of rumour".
The White House said Turkey would now be responsible for all ISIS fighters captured in the area.
Turkish news reports said on Monday an American who was deported by Turkey was caught in the heavily militarised zone between Greece and Turkey after Greek authorities refused to take him in.
Turkey's interior ministry said it had also deported a Dane alleged to be an IS member on Monday.
Monday, state broadcaster TRT Haber said that Turkey aimed to repatriate around 2,500 militants, most to European Union countries.
Opponents of Turkey were invited for protests to be held in front of the White House, spurred by online smear campaigns against Turkey's Operation Peace Spring in northern Syria, which targets the YPG/PKK, the terrorist PKK's Syria offshoot.
"Jihadists and their families are regularly sent back to France and arrested as they leave the airplane".
US House votes to formalise Trump impeachment process
The inquiry now moves into the public eye - giving Americans the chance to hear on live television the evidence against Mr Trump. He is one of several moderates who flipped a GOP district - by a margin of 8 points - to win his seat in the 2018 midterms.
"Then you can take care of your own problem", the Turkish president added.
Dublin has said for months that it has a responsibility to find a way to bring Smith back to Ireland after she became aligned to the militant group in Syria.
"The president is committed to direct engagement in diplomacy, where it is most critical", a senior Trump administration official said regarding the visit.
Some IS members and their relatives were captured in north-eastern Syria in October, when Turkey launched a cross-border operation against the Kurdish-led Syrian Democratic Forces (SDF) there.
A suspected United States citizen who fought with the armed group ISIL and is trapped in no-man's land between the Turkish and Greek border is "not our problem", President Recep Tayyip Erdogan said on Tuesday. President Tayyip Erdogan was cited as saying on Friday that there are 1,201 Islamic State prisoners in Turkish prisons, while Turkey had captured 287 militants in Syria.
It was not clear why Turkey thought Greece would accept a USA citizen.
It's believed the Dundalk woman is being processed for deportation from Turkey.
Many Democrats and some Republicans say Trump erred in making an abrupt decision in October to pull US forces back from positions in northern Syria, opening the way for Erdogan to launch a long-promised offensive against Syrian Kurds there.