NFL considers rule changes that include challenges for penalties

The Indianapolis Colts are proposing a rule change that would allow coaches to challenge any penalty call for the first time.
The NFL released a list of several rule change proposals on Wednesday made by teams that included an option to run a fourth-and-20 play in lieu of an onside kick, the moving of the trade deadline and giving teams an additional challenge if they are successful on one of their first two tries.
The competition committee will make its own rule change proposals next week and o