A senior US Department of State official and expert on Israeli-Palestinian affairs has resigned this week, United States media reported, amid the eight-month war in Gaza that has killed more than 37,500 Palestinians.

Andrew Miller, the deputy assistant secretary for Israeli-Palestinian affairs, cited personal reasons for his decision to leave his job, The Washington Post newspaper reported on Friday.

Miller told colleagues that he wanted to spend more time with his family as the current conflict which started in October had “become all-consuming”, the report said.

He was a sceptic of US President Joe Biden’s “bear hug” approach towards Israel’s government, said the Post, which first reported Miller’s departure.

Miller’s is the latest in a string of resignations from the Biden administration across several government agencies over Washington’s continued support for Israel.

The Post added, however, that Miller told colleagues that if not for his personal responsibilities, he would have preferred to remain in his job including in areas where he disagreed with administration policy.

Reporting from Washington, DC, Al Jazeera’s Kimberly Halkett said it underscored growing frustration within the Biden administration over the president’s staunch support for Israel’s war on Gaza.