Sen. Marco Rubio -- Chris Christie's In a Lose-Lose Situation ... With Dallas Cowboys

Chris Christie got himself into one of those "damned if you do, damned if you don't" situations with the Dallas Cowboys ... so says Sen. Marco Rubio who tells TMZ Sports this won't end well for the NJ Gov.

As everyone sits and waits to see if Christie once again joins Jerry Jones in the owner's box when the team takes on the Green Bay Packers this weekend ... Rubio says, "He can't win either way."