Abizaid, who was nominated by US President Donald Trump last year, was voted 92-7 by the Senate, thereby confirming his post, amid a strain in relations between the US and Saudi Arabia in the wake of dissident journalist Jamal Khashoggi's death, The Hill reported.
Having a military background, Abizaid served as head of US Central Command (CENTCOM), the force unit present in the Middle East, and led missions in Iraq, Kosovo and Bosnia-Herzegovina. He was also the deputy commander of CENTCOM from 2003 to 2007.
The vacancy in the envoy post had become a bone of contention in the wake of the gruesome incident.
The Trump administration has been facing immense criticism from lawmakers for its response to Khashoggi's murder.
Khashoggi, who was a journalist with The Washington Post and a vocal critic of the Saudi regime, was killed in the Saudi consulate in Istanbul on October 2 last year, where he had gone to obtain paperwork certifying his divorce with his former wife Alaa Nassif in order to be able to marry his Turkish fiancee Hatice Cengiz.
After presenting several contradictory theories, Saudi Arabia acknowledged that Khashoggi was killed in the consulate premises in what it had described as a "rogue operation".
However, Saudi Arabia has repeatedly rejected all the allegations against its Crown Prince, adding that it is committed to bringing the perpetrators to justice.
The US has also barred the entry of at least 16 Saudi nationals into the country over their alleged involvement in the murder of Khashoggi.Amidst this, Trump, himself had repeatedly expressed his unhappiness over the slow pace of confirmation for his ambassador nominations. In a recent closed-door lunch session with the Republicans, Trump had urged them to speed up the process and fill vacancies in his administration.
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