President Donald Trump referred to Canadian Prime Minister Mark Carney as the “future Governor of Canada” on Tuesday, the latest in a string of barbs he has hurled at America’s northern neighbor—and comments he has made indicating a desire to annex the country—during his second term.

Trump said in a Truth Social post that he was working with Michigan Gov. Gretchen Whitmer “on trying to save The Great Lakes from the rather violent and destructive Asian Carp, which is rapidly taking over Lake Michigan, and all of the beautiful surrounds.” He said he plans to ask other governors to participate in the effort, “including those of Illinois, Wisconsin, Minnesota, Pennsylvania, Ohio, Indiana, New York and, of course, the future Governor of Canada, Mark Carney, who I know will be happy to contribute to this worthy cause.”

Since he reentered the White House last year, the President has repeatedly made jabs or critical comments toward Canada and Carney, as well as Carney’s predecessor, Justin Trudeau. Trump has suggested a number of times that the U.S. should annex Canada, calling the country the “51st state.”

“Frankly, Canada should be the 51st state, it really should. Because Canada relies entirely on the United States—we don’t rely on Canada,” Trump said on Fox News’ Sunday Morning Futures last June.

In an interview with TIME last April, when asked if he was “trolling a little bit” on the idea of making Canada the 51st state, Trump replied, “Actually, no, I’m not.”

While Trudeau was in office, he adamantly rejected Trump’s suggestions of annexing the country—a stance that Carney has maintained. Last April, Carney said of Trump’s suggestions of annexing Canada: “As I’ve said to anyone who’s raised this issue in private or in public, including the President, it will never happen.”