U.S. President Donald Trump says he plans to hold Canada accountable for wildfire smoke blowing across the border, vowing the cost will be added to the American tariffs. “We are holding Canada responsible for the fact that they are not properly maintaining their Forests, and Brush therein, and the United States is being unnecessarily invaded by filthy, polluted, and unhealthy air, the quality of which is dangerous, and totally unacceptable,” Trump posted on Truth Social Friday afternoon.He said the wildfire smoke amounts to “Willful Negligence” and is “becoming a yearly occurrence, costing the United States Billions of Dollars, which cost…