Prospective U.S. National Security Advisor (NSA) John Bolton on Sunday said North Korea and the U.S. must use an upcoming summit between the two countries to “cut to the chase” on the denuclearization issue.

Speaking in an interview on the “Cats Roundtable” radio show, Bolton said Pyongyang is seeking to “buy more time” through talks with the U.S. and will attempt to prolong negotiations while it continues developing its nuclear weapons.

Bolton’s comments come following the news on Thursday that U.S. President Donald Trump has chosen him to replace H.R. McMaster as National Security Advisor.

“I think we have to look