TORONTO -- President of the United States is one heck of a job title. It comes with some strong informal titles, as well: "Leader of the free world" and "most powerful man in the world," to name two. After four years of Donald Trump in the Oval Office, though, do those titles still fit? Or have the outgoing president's distaste for long-lived global alliances, harsh treatment of allies and cozying up to dictators irrevocably reframed how the rest of the world sees the U.S.? History will be the final judge of that. Three international relations experts who spoke with CTVNews.ca on Tuesday say whatever long-term effects Trump's presidency may have on his country's place in the international order, they will pose a challenge for president-elect Joe Biden.