U.S.'s Senior Republican Senator John McCain, who serves as a chairman for the Senate Armed Services Committee, met with Turkish President Recep Tayyip Erdoğan and Prime Minister Binali Yıldırım on Feb. 20.
McCain, who has been an ardent promoter of U.S.-Turkey relations, was expected to discuss the Syrian crisis in Ankara.
President-elect Donald Trump praised President Vladimir Putin for refraining from tit-for-tat expulsions of Americans in response to US punitive measures over alleged Russian interference in the November election.
Putin's decision came despite the foreign ministry asking him to send home 35 US diplomats after President Barack Obama had expelled the same number of Russian staff.
Late on Sunday night, the former head of state Nicolas Sarkozy annouced his retirment from politics.
His decision was preceded by his loss in the first round of the primary presidential elections which had to determine the two candidates of the Republican Party who will countinue the race to win a place at the Élysée Palace.