"Our two countries face a pivotal moment in our relationship, and it would be nothing short of tragic to let this opportunity go to waste", Mr Pompeo said in NY after meeting with Mr Kim.
Trump said he was hopeful his summit with Kim would take place on June 12 as originally scheduled but left open the possibility talks would fall through.
White House officials maintain that Trump was hopeful the North was merely negotiating but that he was prepared for the letter to mark the end of the two-month flirtation.
Kim Yong Chol became the first North Korea official in 18 years to visit the White House since President Bill Clinton met in the Oval Office with Jo Myong Rok, a top military official and attache to Kim Jong Il, the current leader's father.
The flurry of diplomacy has also seen a rapprochement on the Korean peninsula, with the two Koreas holding high-level talks Friday at the border truce village of Panmunjom to discuss their ongoing efforts to improve ties.
There were reports earlier on Wednesday that South Korean officials were noting "quite significant" differences between the United States and North Korea over denuclearization.
"I look forward to the day I can take the sanctions off North Korea", Trump said.
He tweeted from New York: "Good progress today during our meetings" with Kim and his team.
Trump wrote in his letter last week that the talks would be "inappropriate" following the "hostility" from North Korea.
The president told reporters "we're going to deal".
After the meeting, Trump and Kim Yong Chol posed for photos on the White House lawn.
The president said they met for two hours.
The White House emphasised that it has remained in close contact with South Korean and Japanese officials as preparations for the talks continue.
'Mike (Pompeo, Secretary of State) has spent two days doing this, we've gotten to know their people very well.
It's all a process.
Before heading off to Camp David for the weekend with Ivanka Trump and Jared Kushner, Donald Trump Jr. and Tiffany Trump, Trump then said he hadn't actually read the letter yet.
The task before Trump is particularly daunting in this case, since never before has a country with a nuclear program as advanced as Kim Jong Un's simply given it away. "It is very important to them".
He said a number of summits might be required.
Russian Foreign Minister Sergey Lavrov walks with North Korean leader Kim Jong Un in Pyongyang during their meeting on Thursday.
Lavrov met with Kim after one of his aides headed to NY for talks to US Secretary of State Mike Pompeo in an attempt to salvage a summit between President Trump and the dictator. But there are lingering doubts on whether he will ever fully relinquish his nuclear arsenal, which he may see as his only guarantee of survival in a region surrounded by enemies. But he has since put it back on track following a conciliatory statement from the regime.
Mike Pompeo says the U.S.is moving forward, hoping for historic achievement. He was carrying a letter for Trump directly from Kim Jong Un. "That I can tell you".
The FBI is still working to access two blackberries, as well as going through the contents of a shredding machine, lawyers said. Daniels has said the payment was meant to buy her silence about a sexual encounter she says she had with Trump in 2006.
Reporters turned to look at the spot he indicated, but there was no sign of the first lady. " She has always been independent". One particularly popular conspiracy theory started by Politico alleged that she left Washington D.C. and went to NY .
After all, even 20-time Grand Slam champion Roger Federer suffered a knee injury while running a bath for his twins in 2016. Williams, who has been out for more than a year after discovering she was pregnant just before the 2017 Australian Open.
When one person replied, "Zero percent chance he delivers", Randall retweeted and commented, "100% chance". And I mean, I'm actually excited about it because just to know that the fan base is like this.
It is unclear who carried out the attack, though the southern province is the Taliban's historic heartland. A suicide vehicle bomb was set off at the gates before three gunmen in suicide vests stormed the compound.
The Cavaliers eventually lost Game 1 in overtime. "So I felt like the odds were against us from the summer". Asked about Thompson's scare after the game, Warriors coach Steve Kerr stated "It looked pretty bad".
The former Democratic governor was convicted on public corruption charges in 2011 and sentenced to a 14-year federal prison term. Trump told reporters Thursday that no one asked him to pardon D'Souza, whose case had become a cause in conservative circles.
The Cavs were stunned when Irving requested a trade after last year's Finals, saying he wanted to be "the focal point" of a team. The big win now marks the eighth straight year that The King has made it to the NBA Finals , and the moment was not lost on him.
Weinsteins' decision to turn himself in was preceded by extensive discussions between his lawyers and prosecutors, Mueller says . He was then charged with rape , a criminal sex act, sex abuse and sexual misconduct for incidents involving two separate women.
Las Vegas Heat Wave Melting Ice at Stanley Cup Final
Anything they can put a jersey on, they've got a jersey on; statues, buildings, it's insane . "I think he embraces the challenge". The Golden Knights trailed 3-2 entering the final 20 minutes but couldn't net the equalizer despite a 15 shot barrage.
Russia, Ukraine blame each other for journalist killing
This was in part because several prominent Russian journalists critical of Putin's policies have been murdered in recent years. It said it had detained a Ukrainian citizen recruited by Russian Federation to find someone to kill Mr Babchenko.
Facebook to Drop Trending-Topics Feature
Another feature, called Today In shows people breaking news in their area from local publishers, officials and organisations. However, it was only available in five countries and accounted for less than 1.5% of clicks to news publishers on average.
It's on - 25-per-cent steel tariff to take effect at midnight
Shares of industrial heavyweights Boeing and Caterpillar both fell, with Boeing down 1.7 percent and Caterpillar down 2.3 percent. Europe, Canada and Mexico say that as close allies of the United States they should receive exemptions from the measures.
Bethesda Officially Announces Fallout 76
The event will be livestreamed so those that aren't able to attend in person will be able to catch the highlights as they happen. This is somewhat unsurprising, as Bethesda and Todd Howard both spoke about the multiplayer potential of the franchise.
McKinney 14-year-old wins National Spelling Bee
He said there were eight or nine words during the prime-time finals he didn't know - a rare admission for a national champion. Bailly, the bee's official pronouncer, told him, "That is correct!" and confetti rained down on the stage.
Lauren Cohan Exiting Walking Dead
It will be interesting to see what AMC has to say about the future of The Walking Dead after season 9. Lincoln is expected to appear in just six new episodes, less than half of the 16 installments booked.
20-year-old woman's arrest at Jersey beach goes viral
Weinman screams in the video, as she walks away from the officer. "OK, you can see it, but we're not drinking it", Weinman says. The video cuts out momentarily, then shows Weinman screaming as the police officer pulls her to the ground and grabs her hair.
Spain’s Carvajal still hopeful of playing at the World Cup
Salah was forced off injured in the first half after he could no recover from a knock to his arm following a collision with Ramos. Carvajal had previously missed the UEFA 2016 Euro due to an injury he picked up during that year's Champions League final .