On Thursday, the two will meet again before proceeding to Montreal to meet with Philippe Couillard, the Premier of the French-speaking province Quebec.
Mr Altmaier also underlined the importance of European unity on free trade and economic interests, especially since domestic debate was continuing in the United States about punitive sanctions imposed by Mr Trump on G7 allies.
Nothing US President Donald Trump is doing will "make the world better, safer, or more peaceful", German Foreign Minister Heiko Maas told the daily Süddeutsche Zeitung on Friday.
The agenda after Trump's departure on Saturday includes sessions on climate change and clean energy and oceans; meetings with leaders from countries outside the G-7, and the closing press conference by the summit's host, Canadian Prime Minister Justin Trudeau.
Trump made the erroneous historical reference during the call with Trudeau on May 25, the network quoted sources familiar with the discussion as saying.
The main meetings will be held two-and-a-half hours north of Quebec City - and of the global media centre housing most of the reporters following the summit - in La Malbaie, Charlevoix.
Sister of Netherlands' Queen Maxima found hanged in Argentina house
Between 2009 and 2011 she worked at the United Nations headquarters of Panama but returned to Argentina in 2012 after a breakup. Argentinian authorities are still investigating the 33-year-old's death but they too have pointed to suicide.
"We think that demonstrating the strength of NAFTA as a solid community as we take on the world is very much in all three of our advantages, and we're going to continue to negotiate that way".
Quarrelling with Trump over his protectionist tariffs on steel and aluminum imports, decision to exit the Iran nuclear accord and retreat from global efforts to combat climate change, erstwhile American allies are turning the summit into something of an intervention, challenging the USA president in the most direct terms to date. "Trump's trying to fix this broken system".
"The American president may not mind being isolated, but neither do we mind signing a six-country agreement if need be", Macron said, adding that U.S. workers would be the first to suffer from a trade war between Europe and the US.
European and Canadian leaders have appeared to band together, ready to stand against Trump at the G7 summit.
The federal government also continued its outreach with top USA lawmakers on Tuesday.
The European Union plans to follow through on its threat to slap new tariffs on US goods.
In Germany, top officials called for Europe to remain unified in the face of rising trade tensions with the United States even as they maintained that America remained its closest partner outside of the continent.