Stephen Miller, one of President Trump’s top policy advisors, made a splash Wednesday during the White House press briefing as he went head-to-head with CNN’s Jim Acosta on the administration’s proposed immigration reform.

The liberal network reporter took issue with the fact that the plan favors immigrants who speak English — and Miller had a strong rebuttal.

“Well first of all, right now, it’s a requirement that to be naturalized, you have to speak English,” said the Trump adviser. “So the notion that speaking English wouldn’t be part of our immigration system would be very ahistorical.”

“This whole notion … that they have to learn English before they get to the United States, are we just going to bring in people from Great Britain and Australia?” asked Acosta.

This is when Miller got heated. “I am shocked at your statement that you think that only people from Great Britain and Australia would know English. It reveals your cosmopolitan bias to a shocking degree. This is an amazing moment… that you think only people from Great Britain and Australia would speak English is so insulting to millions of hard-working immigrants who do speak English from all over the world.”

Needless to say, Acosta stood corrected. Later on, Miller continued to defend the reform and even apologized the the CNN reporter “if things got heated” — but did not relent on the fact that he made “some rough insinuations.”

Watch a clip of the showdown above.