The wrestling circuit had been under pressure to either move, postpone or cancel the event given the broader pullback of financial and media interests in Saudi Arabia over the murder of journalist Jamal Khashoggi.
Trump was scheduled to receive an intelligence briefing at 11:30 am (1530 GMT).
Salah bin Jamal Khashoggi is a dual US-Saudi citizen and had been unable to leave Saudi Arabia after his passport was restricted by the kingdom some months ago.
"Information from the Turkish side affirms that the suspects in Khashoggi's case premeditated their crime", said the statement carried by state TV.
"It is tragic that it took his death to get the Saudi authorities to grant them the freedom to travel", Slim told AFP.
Hallan bomba en casa de Obama
Los agentes investigan las grabaciones de las cámaras de vigilancia para determinar si lo enviaron por correo u otra forma. Un escuadrón antiexplosivos de la Policía se presentó al lugar e implementó el protocolo de seguridad .
Saudi Arabia had called the murder a "huge and grave mistake", in which the Washington Post columnist was accidentally strangled after he was placed in a chokehold during an interrogation.
The event sparked online anger, when Riyadh released a photo of a stone-faced Salah shaking hands with Prince Mohammed, a man many widely accused of being behind the killing of his father.
Speaking in Ankara, Erdogan said Turkey will "not allow the murder to be covered up" and will be transparent in sharing any evidence it uncovers. Trump appeared to support the Crown Prince at the time.
The CIA's director is due to brief Donald Trump after listening to an audio recording of the murder of Saudi journalist Jamal Khashoggi.
The source told the newspaper that the Saudi Allegiance Council had secretly met to discuss the issue of Khashoggi.
At a conference in Riyadh on Wednesday, the crown prince said the killing was a "heinous crime that can not be justified" and warned against any efforts to "manipulate" the crisis and drive a wedge between Saudi Arabia and Turkey, which are regional rivals but also diplomatic and business partners.
Conflicting reports surfaced about whether Turkish investigators had searched a well in the garden of the Saudi diplomatic compound as part of their probe.
In his first public comments on the matter, bin Salman promised on Wednesday that the killers would be brought to justice.