Although Clancy himself had misgivings about the film when it was initially in production, he was eventually won over by the excellent performance by Harrison Ford.
For decades, politically minded action movies often involve the President ... the POTUS who has to save himself. Who else but Harrison Ford could play the ready-to-rumble Head of State?
Harrison Ford was concerned that one of his co-stars was preparing to upstage him, and his assumptions were proven to be entirely correct.
The director also revealed that Ford is one of his heroes. “I am aware that you got to be careful about meeting your heroes. I did wonder, ‘Is Harrison best left as a hero in my mind?'” ...