President Trump tweeted Wednesday evening a response to British Prime Minister Theresa May's comment that it was "wrong" for him to re-tweet anti-Muslim hate videos posted by a member of a far-right group in the U.K.

Why it matters: It was an extraordinarily rare move for a British prime minister to publicly condemn the actions of a U.S. president. True to form, Trump isn't backing down, and is prolonging that dispute.