Donald Trump’s nominees to become the next US ambassadors to Saudi Arabia and Iraq are scheduled to meet with lawmakers during confirmation hearings on Capitol Hill this week.

The hearings arrive a day after the Senate was provided new details about the murder of Washington Post journalist Jamal Khashoggi during closed-door meetings on Tuesday afternoon.

Khashoggi, whose disappearance after entering a Saudi consulate in Istanbul last year sparked a global outcry against the Saudi government and its reported involvement in the killing, is likely to be a major focus throughout the hearings.

Mr Trump nominated John Abizaid for the ambassador to Saudi Arabia post, celebrating his military career in an announcement the White House released in November last year. Mr Abizaid is a retired four-star US Army general and “the longest-serving commander of United States Central Command,” according to the White House statement.

Meanwhile, the president nominated Matthew Tueller to become the next top diplomat in Baghdad. Mr Tueller currently serves as the US ambassador in Yemen. If confirmed, he will replace Douglas Silliman, who has been the US Ambassador to Iraq since 2016.

Despite neither appointment facing public accusations from the minority of being a political handout, the Senate confirmation hearings could prove contentious after Senators expressed deep frustrations following a closed-door briefing with officials from Mr Trump’s administration on Monday surrounding the death of Khashoggi.

Jamal Khashoggi death: key figures Show all 7 1 /7 Jamal Khashoggi death: key figures Jamal Khashoggi death: key figures Jamal Khashoggi Washington Post journalist who was critical of the Saudi regime and the young Crown Prince Mohammed bin Salman, he was murdered on 2 October in the Saudi Arabian consulate in Istanbul AFP Jamal Khashoggi death: key figures Saudi Crown Prince Mohammed bin Salman Heir to the Saudi throne, Mohammed bin Salman has been implicated in the murder, with US officials claiming that he must have known of the plot AFP/Getty Jamal Khashoggi death: key figures 15 man hit squad Turkish police suspect these 15 men of being involved in the murder of Jamal Khashoggi, issued 10 October, 8 days after the journalist disappeared EPA Jamal Khashoggi death: key figures Saud al-Qahtani Aide to Crown Prince Mohammed bin Salman, Saud al-Qahtani is claimed to have ordered Khashoggi's murder Saud Al-Qahtani/Twitter Jamal Khashoggi death: key figures Maher Abdulaziz Mutreb A former diplomat who often travelled with the Crown Prince, Mutreb was initially claimed to be the leader of the hit squad and is pictured here entering the Saudi consulate on the day of the murder AP Jamal Khashoggi death: key figures Mustafa al-Madani First implicated in the 15 CCTV photos released by the Turkish police, al-Madani was later found to have been used as a body double for Khashoggi, leaving the Saudi consulate dressed in his clothes on the day the journalist was killed CNN Jamal Khashoggi death: key figures Salah bin Jamal Khashoggi (L) Son of the murdered journalist met with Crown Prince Mohammed bin Salman on 23 October EPA

Lawmakers had instructed Mr Trump to order an investigation into Khashoggi’s killing by invoking the Global Magnitsky Act. The request was made in October of last year, which gave the president 120 days to respond. But the White House declined to submit a report by the deadline, angering members of the Senate Foreign Relations Committee.

On Monday, Republicans left the closed-door meetings in the Senate appearing not to have learned much else about the administration’s plans to confront Saudi leadership.

“We learned very little,” Mitt Romney told reporters.

Marco Rubio also appeared to criticise the briefing led by Manisha Singh, acting undersecretary for economic growth, energy and the environment at the State Department.

“The Senate will have to decide whether it’s going to impose its own sanctions,” he said.

Khashoggi frequently criticised the Saudi government in his reporting, and lived as a US resident in Virginia. The president has repeatedly refused to implicate Saudi Crown Prince Mohammed bin Salman in the reported murder, despite the assertion of the Turkish and international intelligence communities.

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The Senate confirmation hearings for Mr Abizaid and Mr Tueller were scheduled to begin on Wednesday at 10am local time.