A second meeting between U.S. President Donald Trump and North Korean leader Kim Jong Un is unlikely to occur this year, a senior U.S. administration official said Friday, according to news reports.

"A meeting is likely sometime after the first of the year" in 2019, the official was quoted by Reuters news agency as telling a group of reporters.

The Associated Press ran a similar report, saying that the official spoke on condition of anonymity because details of the meeting have not been finalized.

Trump has said he wants to hold such a meeting after the U.S. midterm elections on Nov. 6, and that he is considering three or four possible locations for the event.

The official made the remark on Friday a week after White House national security adviser John Bolton indicated a second U.S.-North Korea summit may not take place by the end of the year.

The United States and North Korea have been at odds over steps toward Pyongyang giving up its nuclear weapons and ballistic missiles.

North Korea has yet to take credible action to dismantle its weapons programs despite Kim pledging in a historic meeting with Trump in June in Singapore to work toward "complete" denuclearization of the Korean Peninsula.

Washington has demanded that Pyongyang disclose a full inventory of nuclear weapons and fissile materials as a first step toward the U.S. goal of achieving the final, fully verified denuclearization of North Korea.

Pyongyang, however, has insisted it first wants a declaration on ending the Korean War as a way of building trust and guaranteeing its security.

The 1950-1953 conflict ended in an armistice, not a peace treaty, meaning U.S.-led United Nations forces, including South Korea, are technically still at war with North Korea.