Secretary of State Marco Rubio said Friday that South Africa’s ambassador to the U.S. is a “race-baiting politician” who is no longer welcome in the country — the latest sign of tension between the Trump administration and the African nation.

Secretary of State Marco Rubio declared Friday evening on social media that South Africa’s ambassador to the U.S. was barred from entering the country. Rubio shared reporting from the far-right media outlet Breitbart News comments by Ambassador Embrahim Rasool linking President Donald Trump to White supremacy.