Who was withdrawn from the 2007 Tour de France whilst leading the race?

Explanation

2007 was the year of scandal where Michael Rasmussen was pulled out of Tour de France after having been in yellow and a firm contender to win the race. His contract with his team Rabobank was annulled, which in turn saw him withdrawn from the race. Rabobank explained that it was due to an issue with internal rules he had not followed, but earlier, Rasmussen had not been able to account for his whereabouts. Alberto Contador won the race instead with 23 seconds to Cadel Evens and 31 seconds to Levi Leipheimer.