Washington (CNN) An assistant secretary of state who played a key role in recent US-Mexico talks has resigned after reportedly clashing with the Trump administration's immigration policies.

Three administration officials confirmed to CNN that Kimberly Breier, assistant secretary of state for the Western Hemisphere, is stepping down. Citing a senior administration official, The Washington Post , which first reported Breier's departure, said her exit comes after White House policy adviser Stephen Miller chastised her in an email chain over what he perceived to be a lack of commitment to defending the US' asylum agreement with Guatemala

"She often didn't agree with the President's policies," one administration official told CNN.

Another official acknowledged to CNN Breier didn't get along with Miller but she often clashed with many White House staff members, and many White House officials are relieved to see her go.

Breier, whose office was in charge of the Trump administration's attempts to control immigration from Mexico, took issue with the power the White House exerted over immigration and trade issues, according to The Post.

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