Mr Trump did not give his views on who was ultimately responsible.
The three-day event is meant to project Saudi Arabia as a lucrative business destination as it seeks to lessen its dependence on oil revenues and sets the stage for new ventures and multibillion-dollar contracts.
While Mr Trump has ramped up his criticisms of Saudi officials, he has also highlighted the kingdom's importance as a USA ally.
This account attempts to distance Crown Prince Mohammed bin Salman from the killing, even though officials linked to the 33-year-old ruler have been implicated.
AP via CP Jamal Khashoggi speaks during a news conference in Manama, Bahrain on February 1, 2015.
It was two weeks before Saudi Arabia allowed Turkish investigators to search its Istanbul consulate, where Khashoggi was last seen entering and where Saudi Arabia later acknowledged he had been killed.
While Mr Erdogan stopped short of making direct accusations, his speech adds to pressure on Riyadh, which has been facing a wave of global scepticism since claiming over the weekend that Crown Prince Mohammed was not involved in the killing.
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I think I would try always to control myself and to respect the stadium and the supporters that were my supporters for many years. The celebrations caused an altercation in front of the technical area before tensions were calmed before the final whistle.
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The sandy winding tracks that weave their way across the island make for a very bumpy ride for any tourists who visit the island. Prince Harry ventured into the thick rainforest, which covers over 200,000 acres.
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Chancellor Angela Merkel signalled Sunday that Germany will suspend exports of military equipment to Saudi Arabia, and U.K. Foreign Secretary Jeremy Hunt promised to take "serious" measures against the kingdom once an investigation is complete.
"That's why we are pushing for real clear answers on this", he said in a Tuesday interview with the CBC. "Who are these people receiving orders from?" Mr Erdogan made no reference to any audio recording. We have people over in Saudi Arabia now. Instead, much of what he said confirmed reports and leaks citing anonymous officials in the days since the journalist walked into the Saudi consulate in Istanbul.
But U.S. officials have told NBC News that American intelligence agencies believe it's inconceivable that the crown prince had no connection to Khashoggi's death, although they lack "smoking gun" evidence of his involvement. "I think we'll have one. As of now we expect of them to openly bring to light those responsible - from the highest ranked to the lowest - and to bring them to justice".
Mr Trump said he would work with the US Congress to determine the US response to the Khashoggi matter.
"I do not want to leave Canadians holding a billion-dollar bill because we're trying to move forward on doing the right thing", he added. CIA Director Gina Haspel is now in Turkey and is expected to return Wednesday. Erdoğan said that of the 18 men arrested by Saudi Arabia in the investigation, 15 were those already identified by Turkish police as members of the hit squad who flew in and out of Istanbul on the same day Khashoggi was killed. He was told he would need to return later to collect the documents.
Jubeir extended condolences to Khashoggi's family. "To cover up such savagery would hurt the human conscience", he said.
It's "very hard to suspend or leave that contract", Trudeau said Tuesday in an interview with CBC radio, adding the situation is "incredibly frustrating". We have to develop our own data set.