Vietnam has been considered as a venue, along with Thailand, Hawaii and Singapore.
On Tuesday, U.S. intelligence chiefs in their threats report to Congress said that Iran is not now engaged in activities to produce a nuclear weapon.
"We have communicated to our North Korean counterparts that we are prepared to pursue, simultaneously and in parallel, all of the commitments our two leaders made in their joint statement at Singapore last summer", said Biegun.
He also said that "a tremendous amount of good things" were happening in the US-led fight against ISIS. After meeting his top spies in person, though, he insisted they all agree "very much" - a total 180 from Wednesday morning.
The month of February will be critical to the denuclearization of North Korea, a high-level South Korean official familiar with the matter said Thursday.
But the South Korean official ruled out the possibility of easing sanctions on North Korea or a resumption of economic projects between the two Koreas.
Besides sanctions relief, North Korea also is seeking a formal declaration to the end of the 1950s Korean War.
At its summit-in-chief Vladimir Putin, meeting with Russia's government in July previous year, he denied before the assembled press char that Moscow had interfered in US elections for giving a shit-or - what is also in stark contradiction to the findings, among other things, the Federal Bureau of Investigation.
North Korea has complained that the United States has done little to reciprocate for its actions so far to dismantle some weapons facilities and freeze its weapons testing. But following a meeting with his intelligence leaders on Thursday, Trump issued another series of posts, this time blasting the press for having "mischaracterized" and "distorted" what was said at the hearing. We want to keep our journalism open and accessible and be able to keep providing you with news and analyses from the frontlines of Israel, the Middle East and the Jewish World.
"While we would want to be much farther along than we now are, we have made some progress over the last six months, with expectations of much more to come", Biegun said in a speech at Stanford University.
Mr Biegun said that the U.S. administration was "clear-eyed" and prepared for contingencies if talks fail. In May 2018, Trump withdrew the USA from that accord, which he said would not deter Iran.