OTTAWA, Feb 3 (Reuters) - U.S. President Donald Trump will postpone threatened tariffs on Canadian imports for at least 30 days, Prime Minister Justin Trudeau said in a post on X on Monday. Trudeau, speaking after his second conversation of the day with Trump, also said Canada had committed to creating the post of a special czar to combat the smuggling of fentanyl and would ensure permanent monitoring of the shared border. Trump had threatened to impose tariffs on Canadian imports unless Ottawa cracked down on fentanyl smuggling and the flow of illegal migrants across the border.