The White House has dismissed speculations that President Trump's dismissal of his top diplomat Rex Tillerson will cause problems in preparing for his summit with North Korean leader Kim Jong-un.

White House press secretary Sarah Huckabee Sanders said during a news briefing on Thursday that she is certain that there is no vulnerability in preparing the summit talks.

Regarding Trump's decision to replace Tillerson with CIA Director Mike Pompeo, Sanders said that the president wants to appoint the right person at the right position at the right time.

As for media reports that the U.S. has set up a working group to prepare for the summit, the spokeswoman refused to elaborate, simply saying officials are proceeding with the process.

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