White House senior adviser Stephen Miller, an outspoken skeptic of the United States' participation in the North Atlantic Treaty Organization, will write President Trump's upcoming address to NATO

Miller, a longtime Trump aide, has been tasked with writing of Trump's high-profile speeches during his trip abroad. Buzzfeed first reported that Miller is writing the NATO speech.

The stakes will be high with Trump's nationalist inclinations, bolstered by advisers like Miller and chief strategist Stephen Bannon, having led to repeated criticisms of NATO.

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Trump cast the international body as "obsolete" during his presidential campaign, comments that Miller has echoed in his own interviews.

"NATO is an organization made many decades ago that is incongruent with our current foreign policy challenges," Miller told Fox News in March of 2016.

Trump has softened his rhetoric on NATO since taking office. After a White House meeting with NATO Secretary General Jens Stoltenberg, Trump declared that the organization is "no longer obsolete," adding that he wanted NATO to take an "increased role" in the fight against ISIS.

But news that Miller will be writing the speech raises the specter of a return to the original rhetoric considering Miller's more nationalistic worldview.

Miller, the architect of Trump's travel ban on citizens from certain majority-Muslim countries, will also write Trump's speech on Islam.