"Abduction is a very important issue for me because it's very important to your prime minister", Trump said.
Should real progress be made, South Korean President Moon Jae-in's plan involves the development of three economic belts that would link his country's industrial heartland with the North and then with China and Russian Federation.
Madden said the reshuffling at the top of the North Korean military was likely done for a number of reasons, among them: preparation for the Kim-Trump talks and future South Korean negotiations and exchanges.
Trump, who had previously canceled the summit, abruptly announced the meeting was back on.
South Korea's unification and defence ministries declined to confirm the report, while the Unification Ministry said the government was watching the North's leadership situation very closely.More news: Amid growing spat with Facebook, Apple increases privacy controls
National Security Adviser John Bolton was absent from President Donald Trump's meeting with a top North Korean official last week.
There is also a chance Kim may have a bilateral summit with Putin.
Kremlin spokesman Dmitry Peskov said Kim was invited to take part in an economic forum held in the far eastern city of Vladivostok in September.
North Korean media had earlier reported that Army General Kim Su Gil had succeeded Kim Jong Gak as director of the army's powerful General Political Bureau, one of the most senior positions in the country.More news: Tyson Fury confirms comeback fight - and sends warning to Anthony Joshua
"The president has been receiving daily briefings on North Korea from his national security team", Sanders said.
Republican Sen. Marco Rubio of Florida said that while the summit presents the opportunity for a denuclearized peninsula, "I urge the Trump administration to also prioritize human rights and hold accountable the North Korean dictatorship for being one of the world's worst human rights abusers".
Meanwhile Trump has promised to "transform" the rogue state after a meeting with the dictator's right-hand man, Kim Yong Choi. After assuming the leadership in North Korea in 2012, Kim had stated several times that he did not want his people to "tighten their belt" referring to the years of starvation that the country witnessed during his father's rule.
Trump also said that there would be no new sanctions while the talks are taking place, although the White House was at pains to say existing economic sanctions will not be removed either.
If Trump moves forward in recognising North Korea as a nuclear power, Kim may let the IAEA inspectors visit country's atomic power units and agree to halt nuclear weaponisation programme.More news: Trump Tweet: Why Didn't FBI Tell Me About Manafort?