Special counsel Robert Mueller is now investigating whether associates of Mr Trump's presidential campaign colluded with Russian Federation in a bid to sway the 2016 U.S. presidential election.
And according to a report from the Washington Post, it's not something he's particularly looking forward to.
He also expressed a belief that there will be a joint statement at the end of the summit amid speculation that leaders would be unable to agree on a common position.
The United States' closest trading partners - the EU, Canada and Mexico - have vowed to impose retaliatory tariffs on scores of USA products beginning in the coming weeks. Canada, very unfairly. Mexico, very unfairly.
Launched on June 1, 2016, Daily Hive is the evolution of Vancity Buzz and is now in Vancouver, Calgary, Toronto, and Montreal. Trump will be meeting with North Korean leader Kim Jong Un for a historic summit.
The comments come one day after Trump called Trudeau "indignant" on Twitter Thursday night, and referenced a tariff of up to "300% on dairy" saying he was hurting US farmers.
Macron on Thursday said Trump was isolating the United States and suggested foreign leaders might simply wait until Trump's time in the White House has concluded before reengaging with the United States.
For weeks, tensions have been bubbling over an escalating trade battle fueled by the US's imposing tariffs on imports of steel and aluminum from Canada and the European Union. I have been Russia's worst nightmare.
Trump says they will either have a better agreement on NAFTA or two deals involving separate trade deals with both Canada and Mexico.
As he headed to a G7 summit in Canada, Mr Trump said: "Russia should be in the meeting".
While both Macron and Trudeau have forged cordial relationships with Trump, they made it clear they would not be intimidated by the U.S. leader especially in the face of United States tariffs on steel and aluminum imports from Canada, Europe, Japan and Mexico.
Mr Trump said on Friday that the United States and Canada were working on cutting tariffs "and making it all very fair for both countries".
Most recently, Trump pulled the USA out of the Iran nuclear agreement, following his earlier decision to withdraw from the Paris climate accord. He is pushing Mexican leaders for a range of changes to the North American Free Trade Agreement, and he wants that entire pact to expire after five years.
Trudeau and his fellow G7 leaders will try to persuade Trump to reverse the duties when they meet him during the summit.
Blaming past USA leaders for "decades and decades" of bad trade deals with the US's G7 allies, which have led to hundreds of billions of dollars in trade deficits, Trump stressed that "those days are over" and promised to continue his hard-edged approach on trade to straighten out outstanding issues.