  We discuss charge symmetry and charge independence breaking in a chiral
effective field theory approach for few-nucleon systems based on a modified
Weinberg power counting. We construct a two-nucleon potential with bound and
scattering states generated by means of a properly regularized
Lippmann-Schwinger equation. We systematically introduce strong
isospin-violating and electromagnetic operators in the theory. We use standard
procedures to treat the Coulomb potential between two protons in momentum
space. We present results for phase shifts in the proton-proton, the
neutron-proton and the neutron-neutron systems. We discuss the various
contributions to charge dependence and charge symmetry breaking observed in the
nucleon-nucleon scattering lengths.
