Canadian journalist and author Stephen Marche mocked Americans Tuesday by claiming they could be "convinced of anything" after warning that President Donald Trump could lead the U.S. into a war with Canada.Trump met with Canadian Prime Minister Mark Carney for the first time since Carney’s April 28 election on Tuesday. During the meeting at the White House, Carney brought up and dismissed Trump’s interest in Canada becoming a U.S. state, saying that the country won’t be for sale "ever."In response, Trump replied, "Never say never." Marche joined a panel on MSNBC’s "Katy Tur Reports" to discuss the concerns over Trump’s rhetoric