Trump made the comment at the White House Friday after hours of further escalating his rhetoric against longtime allies over USA trade practices.
Solidifying his solo status on the world stage, Trump also lashed out at longtime allies over their criticism of his trade policies and plans an early exit from the G-7 meeting.
Tweeting in English, Macron stressed: "No leader is eternal".
The US president has also reacted to the statements by French President Emmanuel Macron, who said in a press briefing the day before that French and Canadian delegations would try to persuade Trump at the G7 summit to take a more conventional path on trade amid his imposition of tariffs on the European Union and Canada.
US President Donald Trump has hinted at further tariffs on imports from fellow G7 countries if the "unfair trade deals are not straightened out".
"It won't even be hard and in the end, we'll all get along".
Like other countries attending the summit, May has criticized US tariffs, saying on Thursday that the United Kingdom seeks to be "a great champion for free trade around the world".
Trump has repeatedly claimed the US has a large trade deficit with Canada.
"Please tell Prime Minister Trudeau and President Macron that they are charging the USA massive tariffs and create non-monetary barriers..."
In a post before that, Trump accused Canada of slapping U.S. farmers with a hefty tax. "Look forward to seeing them tomorrow", Trump tweeted.
Meanwhile, Canadian Prime Minister Justin Trudeau said the theme of discussions center around what's being described as mutually beneficial economic growth, gender equality, clean energy among other topics.
When Trudeau complained to Trump about the new tariffs he slapped on Canadian goods, saying he was especially upset that the pretext Trump used was that Canada formed a "national security threat" to the US, Trump replied, "didn't you guys burn down the White House?". "They threw Russian Federation out".
Steph Curry, Warriors Pull Away to Take 2-0 Lead Over Cavs
Now that we know both sides of the story, it's up to us to decide. "Thank goodness I never had to play against him", said B.J. The rounds of 71 are three strokes lower than the 74-74 that Curry posted in that Web.com tour event in August.
Before jumping on Air Force One to fly to Canada, which is hosting the summit in La Malbaie north of Quebec City, Trump called for a return to the body's pre-2014 "G8" formula.
The G7 groups Canada, the United States, Japan, Britain, Italy, France and Germany.
Ministers from Germany, France and Britain have already written to USA officials urging them to shield European companies working in Iran from getting caught up in Washington's new sanctions on Tehran.
On Friday, he and Mr. Trump had a one-on-one meeting.
"G-7 Sherpa and Deputy Assistant to the President for International Economic Affairs Everett Eissenstat will represent the United States for the remaining G-7 sessions", she added.
Relations have hit such a low that a key question now is whether the seven countries can agree on a joint statement of priorities at the conclusion of the meeting. "Finance Ministers and Central Bank Governors requested that the United States Secretary of the Treasury communicate their unanimous concern and disappointment". The G7's finance ministers meet more often. "Maybe it doesn't bother the American president to be isolated, but it doesn't bother us to be six if need be".
On Wednesday, Trump's top economic adviser dismissed the hand-wringing over tariffs as little more than a "family quarrel". It's a chance for a group of allies to gather together and discuss their common interests and how they might act together to pursue them. Either we're the victor or the loser, and if it's not obvious that we're the victor then we must be the loser, the chump, the sap, the sucker.
Donald Trumps's decision to pull out of the Iran nuclear deal also demonstrated his reluctance to toe the line of his allies.
Germany has suggested making accommodations over trade with the USA for fear of triggering a ratcheting up of tensions over cars that would embroil companies like BMW and Mercedes.
The globalised economy they helped build had both winners and losers but, until Trump's election, the United States was seen as the system's uncontested leader and a major beneficiary.
For the past week, it was an open question in official Ottawa whether Trump would actually show up, given his recent trade actions against the other G7 countries and his increasingly antagonistic comments about their approach to global relations. But it's nonetheless one that critics have taken issue with, making it relevant here. In New York, the Dow dipped in early trade.
Despite the conflict, Mallaby predicted that the countries would still seek to work with the US, calling it "the indispensable country".