Remarks by South Africa's ambassador to the United States about President Donald Trump were "unacceptable," a State Department spokesperson told reporters on Monday after Washington last week made the decision to expel the envoy.

After Secretary of State Marco Rubio determined that Ambassador Ebrahim Rasool was no longer welcome in the U.S. and posted his decision Friday on social media, South African embassy staff were summoned to the State Department and given a formal diplomatic note explaining the decision,

A researcher at a South African base in Antarctica has been accused of physical assault and sexual harassment. South Africa said it had no immediate plans to remove the accused or any colleagues.

What appeared to be a terrorizing experience at a remote base in Antarctica may be under control, according to officials.

A member of a small South African research team at a remote Antarctic base has accused a colleague of assault and pleaded for intervention, officials have said.