US officials have defended President Donald Trump's decision to meet with North Korean leader Kim Jong-un, saying the move was not just for show and not a gift to Pyongyang.
"President Trump isn't doing this for theatre. He's going to solve a problem," Central Intelligence Agency Director Mike Pompeo told the Fox News Sunday program.
The US expects North Korea to halt all nuclear and missile testing in advance of any meeting, Mr Pompeo and Treasury Secretary Steve Mnuchin said on Sunday news shows.
The goal of the meeting remains denuclearisation of the Korean Peninsula, something Mr Kim has agreed to discuss, they said.
Mr Pompeo said US military exercises in the region would continue in the lead-up to the talks.
The Republican president agreed on Thursday to accept an invitation from the North Korean leader to meet by May after months of escalating tensions over Pyongyang's advancing nuclear and missile programs.
Mr Trump would become the first sitting US president to meet with a leader of the reclusive country.
The two men would face each other after a public volley of insults, with Mr Trump calling Mr Kim "little rocket man" and Mr Kim referring to Mr Trump as a "dotard".
No venue or date for the meeting has been determined, but Mr Trump's prompt acceptance set off a flurry of activity.
The South Korean officials who carried Mr Kim's invitation to Washington will split up to visit the leaders of China and Japan this week to update them on the talks, a South Korean presidential official said on Sunday.
China, North Korea's main ally, has encouraged dialogue over Pyongyang's nuclear program, and its state media on Saturday credited Beijing for helping ease tensions.
"China continues to be helpful!" Mr Trump tweeted on Saturday.
North Korea's leaders have sought a face-to-face meeting with a US president for decades, but have been rebuffed over human rights concerns as well as the nuclear ambitions.
US student Otto Warmbier died last summer shortly after his release from a 17-month detention. Three Americans remain detained in North Korea.
Many Democrats as well as Mr Trump's fellow Republicans said the US should have demanded concessions before granting North Korea a meeting.
"Before they get that kind of prize, we should insist that they make some real changes, verifiable changes to their programs," Democratic US senator Elizabeth Warren said on NBC's Meet the Press.
Ms Warren said she was worried the North would "take advantage" of Mr Trump.
Mr Pompeo and Mr Mnuchin said the US would make no concessions and would keep the pressure on North Korea by maintaining economic sanctions and a strong US defence posture before the meeting.
They also dismissed criticism Mr Trump's decision to meet elevated the North Korean leader on an international stage.
"This administration has its eyes wide open, and the whole time this conversation takes place the pressure will continue to mount on North Korea," Mr Pompeo said on CBS' Face the Nation.
