The case has the potential to further strain ties between the United States and Turkey, which is already demanding Washington hand over a U.S.-based Turkish cleric it alleges was responsible for the failed coup.
In an interview, Trump called for vigilance to deter people coming from countries 'compromised by terrorism.'
If Russia attacks American allies, he would first review if they 'have fulfilled their obligations' to the U.S. before deciding whether to come to their aid.
Secretary of State John Kerry will also host a joint meeting of defense and foreign ministers in the counter-ISIS coalition that will focus on recent the developments in Libya.
F-16 jets guarded Turkish airspace days after the failed coup, signaling authorities were not sure threat against the government was over.
The Canadian premier toured the concentration camp together with a survivor who now lives in Toronto.
While NATO will boost its eastern flank in response to Russia's continued annexation of Crimea, some member states are growing weary of Ukraine's corruption and sluggish economy.
The alliance will be discussing how to retool the Cold War-era military alliance to face a daunting range of modern threats, from a hostile Kremlin to religious-fueled violence and attacks in cyberspace.
A day before NATO leaders meet to cement a new deterrent against an emboldened Russia, Germany's chancellor says Berlin wants a constructive relationship with Moscow.
Russia and NATO are each building up military capability in Eastern Europe, spurred by the conflict in Ukraine.