Chris Froome has said that he is at a loss as to how to further explain that he rides clean.
Froome is quoted by the Daily Telegraph as saying: "What haven't I done? I've tried to be as much as a spokesman as I can for clean cycling.
"I've spoken to the Cycling Independent Reform Commission, I've made suggestions to the governing body to implement things like night-time testing.
"I've pointed out when I've felt there hasn't been enough testing, in places like Tenerife. What else is a clean rider supposed to do?"
When asked if he was fed up with people making comments and accusations, Froome added: "It's not difficult for me to stay cool. It would be a different story if I had something to hide. I know I'm a clean rider. I know I've worked extremely hard to be in this position. I'm really proud of that. It doesn't make me angry.
"I do understand where the questions are coming from; the history of the sport and the people before me who have won the Tour.
"I am sympathetic, but at the same time there needs to be a certainlevel of respect also. I've worked extremely hard to get here. I'm not going to let anyone take that away from me."