The man who has been rumored to be angling for United Nations Secretary General after his presidency may want to brush up on his world leaders before he formally applies.

Barack Obama struggled to pronounce the name of former Singapore Prime Minister Lee Kuan Yew during a press conference Tuesday.

“In less than a generation, under the vision and stewardship of Prime Minister Lee — Q Juan — uh, (laughs) Lee Kuan Yew,” Obama said.

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Lee Kuan Yew was prime minister from 1959 until 1990. He died in 2015.