While he has not explicitly given a reason for his absence, Trudeau's missed attendance at the meeting comes amid the COVID-19 pandemic and as the number of cases in the USA continues to rise.
While Trudeau remains in Ottawa, Lopez Obrador and Trump will meet at the White House to mark the start of the United States-Mexico-Canada Agreement, which went into effect July 1.
"Despite recent discussions about Canada's possible participation, the Prime Minister will be in Ottawa this week to hold scheduled cabinet meetings and take part in a long-planned meeting of parliament", his office said.
Trudeau previously said he was not sure about attending, citing tensions over possible USA tariffs on Canadian aluminum, Reuters reported.
The trip to Washington will be Lopez Obrador's first official overseas visit, and he will meet Trump on Wednesday.
President Trump sent a handwritten note to over a dozen members of the Congressional Hispanic Caucus informing them that he would not cancel his meeting on Wednesday with Mexican President Andrés Manuel López Obrador, as they had requested.
Tropical depression heads for Bermuda
That disturbance was a low within a larger area of low pressure off the northern Gulf Coast as of Sunday afternoon. This is not the only system in the Atlantic basin that has the potential to show into a tropical system this week.
"The entry-into-force of the new NAFTA is good for Canada, the United States, and Mexico", the rep said in a statement.
The pair also spoke about the ongoing fights against COVID-19 in their respective countries.
Last week, when asked about the meeting, Trudeau expressed concerns about Trump's threat to place new 10-per-cent tariffs on Canadian aluminum. It will help ensure that North America emerges stronger from the COVID-19 pandemic'.
'We're obviously concerned about the proposed issue of tariffs on aluminum and steel that the Americans have floated recently, ' Trudeau told reporters. At the North Atlantic Treaty Organisation summit in London a year ago, Trudeau and other world leaders were caught on a hot mic mocking Trump. 'But he tolerated them, mockingly crossing swords with them in meetings, kidding on the straight'.
Trump erupted at Trudeau after a G7 meeting in Canada, and instructed aide Larry Kudlow to go after him, Bolton writes, in a passage picked up by the CBC.
As of Sunday, the US has seen more than 2.8 million cases of COVID-19 and 129,000 deaths.