With no official peace treaty and a heavily fortified border between them, the Koreas are still very much living the Cold War.
The U.S. president said he looked forward to lifting sanctions on North Korea.
Trump's request is a shift in tone from his own tweets about the North Korean Leader.
The two leaders will have a private chat for two hours.
President Donald Trump has rejected G7 allies while speaking warmly of North Korean dictator Kim Jong Un.
The historic summit has already been endangered once by incendiary remarks from Trump's White House.
Local rights groups say at least 40 people have gone missing in Nuevo Laredo since February.
An official newspaper blamed U.S. "hack media on the payroll of power" for insinuating that North Korea was pursuing talks to get an economic handout.
Kim Jong Un "has created sort of a cushion for failure, that if the U.S. backs away, the Chinese and Russians will be behind him," 38 North's Joel Wit said.
North Korea threatened a "nuclear-to-nuclear showdown" after Vice President Mike Pence suggested Kim Jong Un could be overthrown.
President Donald Trump's decision came shortly after a top North Korean diplomat insulted the vice president, but there may be more at play.
The video shows a young Arab boy appealing for world leaders to end conflicts in the Middle East and recognize Jerusalem as "the capital of Palestine."
North Korea is growing increasingly wary of the U.S.'s intentions ahead of a historic meeting between Kim Jong Un and Donald Trump.
North Korea said it would it would take apart its only known nuclear test site, and these images show its already started.
North Korea has justified its nuclear weapons with the U.S.'s long history of invading its foes across the world.