In another tweet, Trump said he's "looking forward to seeing" Macron and Trudeau and accused them of "charging the US massive tariffs and create non-monetary barriers".
Trump is heading to the G7 Summit in Quebec, Canada with almost every other attendee mad at him. Watch live in the player above.
The United States, Mexico and Canada agreed to NAFTA in the 1990s, and all three countries have worked to renegotiate the deal since Trump became president.
PBS NewsHour will update this story as it develops.
Mr Trump is expected to face stern opposition from the majority of the group over his protectionist policies on trade, including harsh new tariffs on steel and aluminium which would hit the European Union and Canada.
Likewise, Macron described the moment as a period of "great challenges", but also defended his efforts to befriend the American president, saying the U.S.is a historical ally and "we need them". Canada vowed to hit the US with almost $17 billion worth of tariffs on various goods from the USA, such as toilet paper and maple syrup, and the European Union announced planned duties as well.
Other G7 leaders, including British Prime Minister Theresa May and German Chancellor Angela Merkel, have also spoken out against the US tariffs.
Russian Presidential Aide Yuri Ushakov said in late May that no preparations were underway for a meeting that could take place before the G20 summit in November.
The summit begins Friday in La Malbaie, in Charlevoix, north of Quebec, and runs until Saturday, when Trump flies on to Singapore.
Donald Trump is ramping up his blast of Canada on Twitter this morning over what he says are unfair trade practices as the US president prepares to make his Canadian debut later today.
Most recently, Trump pulled the US out of the Iran nuclear agreement, following his earlier decision to withdraw from the Paris climate accord.
Russian Federation was suspended from what was then called the G8 in 2014 because of its annexation of Crimea from Ukraine.
The package would include increased purchases of USA soybeans, corn and other agricultural goods.
Trump will skip out on G-7 meetings about climate change, clean energy and ocean protection.
"The six other G7 countries combined form a larger market than the American market".
Trump, who met with Japanese Prime Minister Shinzo Abe in Washington before the summit, may be more preoccupied with next week's historic nuclear summit with North Korean leader Kim Jong Un.
But they also made it clear that won't keep them from pushing Trump to end the tariffs, which they brand as illegal and bad for everyone's economy. The agreement included Germany and the five permanent members of the United Nations Security Council, which includes France and Britain - all G7 members.
In the days leading up to the summit, Trudeau and Macron have severely criticized Trump's new tariffs, which critics say threaten to drive up prices for American consumers and companies and heighten uncertainty for businesses and investors around the globe. He's in standoffs with Mexico, Canada, China, Japan and members of the European Union, the largest US trading partner.
"On Russia rejoining the G7, our position has not changed", said Adam Austen, spokesman for Canada's foreign affairs minister Chrystia Freeland.