Washington (CNN) The list of potential sites for a summit between President Donald Trump and North Korean leader Kim Jong Un has been narrowed to two countries, Trump said Friday.

"I think some very good things can happen with respect to North Korea. We're setting up meetings now. We're down to two countries, as to a site, and we'll let you know what that site is," Trump said during a news conference with German Chancellor Angela Merkel.

While the two sides have yet to arrive at a decision on where the summit will be held, US officials favor Singapore, according to two people familiar with the discussions.

Officials have ruled out sites in China and the Korean Peninsula for the talks, determining they wouldn't appear neutral. Other locations in Europe appear less likely, the officials said, citing difficulties in getting Kim there on his rickety fleet of aircraft.

Mongolia also remains an option, but is viewed as less ideal because it is more remote. It's not clear when a final site will be announced.

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