WASHINGTON – President Donald Trump is planning to fly to Canada on Friday. He is not exactly happy about it. The president has vented privately about Canadian Prime Minister Justin Trudeau as their trade tensions have spilled into public view. He has mused about finding new ways to punish the northern neighbor in recent days, frustrated with the country’s retaliatory trade moves. And Trump has complained to aides about spending two days in Canada for a summit of world leaders, believing the trip is a distraction from his upcoming Singapore summit with North Korean leader Kim Jong Un, according to three people familiar with Trump’s views. In particular, the president said Tuesday to several advisers that he fears attending the Group of Seven summit in rural Charlevoix, Quebec, may not be a good use of his time because he is diametrically opposed on many key issues with his counterparts – and does not want to be lectured by them. Additionally, Trump has griped periodically both about German Chancellor Angela Merkel – largely because they disagree on many issues and have had an uneasy rapport – as well as British Prime Minister Theresa May, whom he sees as too politically correct, advisers say. Behind the scenes at the White House, there have been staff-level discussions for several days about whether Trump may pull the plug on the trip and send Vice President Mike Pence in his stead, as he did for an April summit of Latin American leaders in Peru. Then, Trump was preparing for missile strikes in Syria, and opted to remain behind in Washington.