During the same period, the U.S. share of global steel production dropped from 12 percent to 5 percent. "I believe they will honor that commitment!", he said.
A Blue House official told reporters earlier on Sunday the truce village of Panmunjom at the inter-Korean border is a strong candidate for the U.S. -North Korea summit.
"I do not want to talk about Korea at all".
"Unfortunately", he said, "this possibility is made easier by accepting the invitation prior to the customary staff work that usually precedes a summit".
The meeting potentially provides a framework through which the two Koreas and the United States can de-escalate years of tension that ratcheted up as the Kim regime tested nuclear bombs, launched ballistic missiles over Japan and threatened to destroy U.S. cities.
Sweden has been named as a possible venue for the meeting by the US's Washington Post newspaper, broadcaster ABC News, and others.
The president said North Korea has promised to halt missile testing ahead of any discussions - a pledge he said he expects Kim to keep - and that the "greatest deal for the world" could be reached.
In another tweet, Trump said that the mainstream media was startled and amazed at his decision on Friday.
The White House announced late last Thursday that Trump would accept an invitation to meet face-to-face with Kim, following months of insults and threats between the two leaders.
Trump had previously said he was willing to meet Kim under the right circumstances but said the time was not right for such talks.
"We can't do what we did with Iran and let off the pressure and then just watch the behavior go in the wrong direction", the Wisconsin Republican, who serves on the Senate Foreign Relations Committee, said on CNN's "State of the Union".
"If you're not going to do that, we're going to tax Mercedes Benz, we're going to tax BMW".
Trump's sudden decision to meet with Kim stunned even people in his own administration.
More recently Sieg Hecker former Director of the Los Alamos Laboratory, and in my view one of the best U.S. experts on the DPRK nuclear weapon capability, stated in a recent article in 'Foreign Affairs': "Washington should be ready to reciprocate - or if necessary, to initiate the discussion".
In the stands of the Alpensia Biathlon Centre, spectators watching the North's first Winter Paralympians welcomed their presence as a sign of improving ties, and said they hoped the rapprochement would last.
Pompeo said he briefs the president nearly every day. Le Pen will attempt to revive her battered party this weekend at a conference with a proposal to ditch the tainted National Front brand, seen as a key hurdle to winning power.
However, the statement confirmed that: "The Republic of Korea, the United States, and our partners stand together in insisting that we not repeat the mistakes of the past, and that the pressure will continue until North Korea matches its words with concrete actions". There's now even a Chinese hypersonic jet fighter that flies more than 7500 miles per hour! He's not going to give that up. But this isn't John F. Kennedy or Abraham Lincoln - it's #Donald Trump, so don't get your hopes up too high.
This is a moment for all Americans.