Michael Phelps banned by World Championship for second drink-driving offence . Phelps was excluded from USA 's USA Swimming squad . But USA executive director Chuck Wielgus may allow Phelps to compete .
Michael Phelps banned by USA Swimming for second drink-driving offence . Phelps was excluded from USA 's World Championship squad . But USA executive director Chuck Wielgus may allow Phelps to compete .