The State Department's top diplomat for Latin America reportedly submitted her resignation earlier this week.

Officials told The Washington Post on Wednesday that Kimberly Breier, secretary of State for the Western Hemisphere since October, resigned due to personal reasons.

The newspaper noted that the State Department is expected to announce her move on Thursday. Breier referred the Post's questions to the State Department, which did not provide comment. The State Department did not immediately respond to a request for comment from The Hill.

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As secretary of State for the Western Hemisphere, Breier has been tasked with building partnerships with South American nations and controlling immigration levels from Mexico and other countries in the Central America region. She worked on Latin American issues in the State Department's policy planning office before taking on the assistant secretary of State position, the Post noted.

Breier reportedly opposed the control the White House sought over matters related to Mexico.

The Post, citing an unnamed administration official, reported that White House adviser Stephen Miller Stephen MillerSpecial counsel investigating DeVos for potential Hatch Act violation: report Trump confirms another White House staffer tested positive for COVID-19 Biden pick creates furor, underscoring bitterness over Obama immigration policy MORE had chastised her in an email over her position on the U.S. asylum agreement with Guatemala. Miller was reportedly outraged by her insufficient defense of the agreement, which will require migrants traveling through the Central American nation to apply for asylum there before continuing to move toward the U.S.

It remains unclear if their exchanges had anything to do with Breier's departure, the Post noted.

Ivanka Trump Ivana (Ivanka) Marie TrumpThe Hill's 12:30 Report: Trump stokes fears over November election outcome Special counsel investigating DeVos for potential Hatch Act violation: report Trump, Biden vie for Minnesota MORE, a White House senior adviser and the president's daughter, thanked Breier for her service in a tweet on Wednesday night.

"Thank you @WHAAsstSecty Kim Breier for your friendship and great service," she said in a tweet.