A pair of top State Department officials, including the lead envoy to the United Nations, have announced they will leave their posts, Foreign Policy reported on Sunday.

Tracey Ann Jacobson, a career foreign service officer responsible for overseeing U.S. policy at international organizations including the U.N., told her staff on Friday that she will continue in her post until early October but did not specify why she was leaving, a U.S. official told Foreign Policy.

Her announcement comes as Trump is slated to speak in front of world leaders at the U.N. General Assembly in September.

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Also on Friday, William Rivington Brownfield, the U.S. assistant secretary of State for international narcotics and law enforcement affairs, told his department that he would leave by the end of September, according to the report.

Brownfield’s wife, Kristie Kenney, one of the most senior foreign service officers in the State Department, had announced her resignation four months earlier.

Their announcements follow a stream of other State Department departures since President Trump took office in January. Foreign policy professionals are either leaving on their own or being pushed out over growing frustrations with an administration that seeks to dramatically cut funding to the department’s budget — as much as 37 percent.