Trump tweeted: "As most people know, and for those who would like to know, I am strongly Pro-Life, with the three exceptions — Rape, Incest and protecting the Life of the mother — the same position taken by Ronald Reagan".
Trudeau also expressed his condolences for the victims of the shooting at the Capital Gazette newspaper in Annapolis, Maryland, the Canadian statement said.
Trump is to visit China in November, as well as attend the Asia Pacific Economic Cooperation meeting in Vietnam, the White House announced earlier.
Trump told carmakers at a meeting in the White House on May 11 that he was planning to impose tariffs of 20 or 25 percent on some imported vehicles and sharply criticized Germany's automotive trade surplus with the United States.
Trump pledged during the presidential campaign to renegotiate the accord, but he has wavered on the issue since winning the presidency. His top officials have appeared divided about what to do about the deal, under which the United States pledged to significantly reduce planet-warming carbon emissions in the coming decade.
Trump's shift came one day after Republican leaders in the US House of Representatives twice delayed a vote on a "moderate" or "compromise" immigration bill amid chaos over the White House practice of separating families who illegally cross the US border.
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Trump, speaking at a press conference in New York on the sidelines of the United Nations General Assembly on Wednesday, threatened to tax cars imported "if Canada doesn't make a deal with" the United States.
Trump's words came one day after Pyongyang released a series of positive signals over the denuclearization of the Korean Peninsula.
Trump has instructed the Department of State to move the US embassy there from Tel Aviv.
Trump also announced last week that the US Treasury should receive a percentage of the proceeds from any sale, which China has denounced as a "mafia" deal.