Prince Harry is filling in as guest editor over the Christmas period for Britain’s premier morning radio news and current affairs show, and he has landed a star interview for his debut—a chat with former U.S. President Barack Obama.

The interview was recorded at September’s Invictus Games in Toronto, and will be broadcast on BBC Radio 4 on Dec. 27.

In a teaser released this weekend, the pair displayed an easy familiarity as they traded quips.

“Do I need a British accent?” Obama asks.

Harry responds “not at all” before warning the former commander in chief that he’ll get “the face” if there are any long pauses between answers.

After Harry displays the skeptical expression one might associate with a stern news interviewer, Obama replies: “I don’t want to see that face.”

Kensington Palace said the conversation—which will be broadcast on the BBC on Dec. 27—focuses on the pair’s “shared interest in building platforms for the next generation of young leaders.”

Obama also reminisced about his memories of leaving office and discussed his post-presidential work with the Obama Foundation, according to the palace.

Harry and Obama have worked together to espouse the cause of helping wounded veterans, and become friends.

Last year, Obama and his wife, Michelle, challenged Harry and his British competitors “to bring it” ahead of the event in Orlando. Harry enlisted his grandmother, the queen, for his comical response.

In addition to the Dec. 27 broadcast, Kensington Palace said the interview will also be released as a podcast.