"It will be over a relatively short period of years", Trump said.
"For years presidents have been coming to these meetings and have talked about the tremendous expense to the USA, and tremendous progress has been made", Mr Trump said.
Trump closed out the tumultuous two-day summit by reaffirming the United States' commitment to the almost 70-year-old alliance and signing the joint declaration, despite spending much of the summit berating allies over defence spending and accusing Germany of being beholden to Russia because it buys Russian natural gas.
President Trump criticized British Prime Minister Theresa May's handing of Brexit Thursday, telling The Sun newspaper that her plan was "very unfortunate" and would "probably" kill any possible trade deal between the us and the United Kingdom. The new communique says 24 allies will meet the 20% guideline by 2024.More news: Gboard lets you communicate in Morse Code
"Yesterday I let them know that I was extremely unhappy with what was happening", he said. He said the USA commitment to the 29-member North Atlantic Treaty Organization remains very strong and cited "the additional money they will be putting up" and "the level of spirit in that room" during the meetings.
"I think he has done a bad job on crime, if you look, all of the awful things going on there, with all of the crime that is being brought in", he said. They're happy to do it. "We are cracking down right now on the European Union because they have not treated the United States fairly on trading".
It was the most recent in a series of demands and insults that critics fear will undermine the decades-old alliance, coming days before Trump sits down with Putin at the conclusion of his closely watched European trip.
Instead, a series of events - a black-tie dinner with business leaders, a meeting with Prime Minister Theresa May and an audience with Queen Elizabeth II - will happen outside the bustling city, where Mayor Sadiq Khan has been in a verbal battle with Trump.
"We are not going to finance it for them but we will make sure that they are able to get payments and various other things so they can buy - because the United States makes by far the best military equipment in the world: the best jets, the best missiles, the best guns, the best everything". "They're going to up it at levels that they've never thought of before".More news: Federation Internationale de Football Association warns broadcasters about focusing on 'hot women'
"He's been very nice to me the times I've met him".
At NATO, Trump did not specify which countries had committed to what, and it remained unclear whether any had changed their plans. "What they're doing is spending at a much faster clip". That would mark a significant milestone for the alliance. It's also always been a bugbear for the U.S., which spends more on defence both as a percentage of GDP and in absolute terms than any other member. He said the 29-nation alliance supports the territorial integrity of Georgia, including its sovereignty over the breakaway regions of Abkhazia and South Ossetia. Officials said no explicit threat was made.
"President Trump never at any moment, either in public or in private, threatened to withdraw from NATO", Macron said. Nonetheless, the 2018 summit has refocused attention on the 2% benchmark, highlighting how it distracts from the broader contribution member states make to North Atlantic Treaty Organisation.
NATO Secretary General Jens Stoltenberg cited a "new sense of urgency, and all allies agreed to redouble their efforts". The US is paying for Europe's protection, then loses billions on Trade.
Trump used a session to intended for discussion of Georgia and Ukraine - two countries that have tense relations with Russian Federation - to trumpet his spending concerns and rail against European countries, including Germany and Spain, for failing to contribute more to their defenses and relying too heavily on the largesse of the United States. "We urge Russian Federation to cease all political, financial and military support to militant groups and stop intervening militarily in the Donetsk and Luhansk regions and to withdraw troops, equipment and mercenaries from the territory of Ukraine". Leaders explained to Trump that they could not make firm commitments inside the closed meeting, since majority needed parliamentary consent to expand budgets.More news: Dan Martin powers to Tour stage victory
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