Sen. John McCain (R-Ariz.) will return to the Senate on Tuesday after being diagnosed with brain cancer, giving the GOP push to repeal and replace ObamaCare a boost of momentum. “Senator McCain looks forward to returning to the United States Senate tomorrow to continue working on important legislation, including health care reform, the National Defense Authorization Act, and new sanctions on Russia, Iran and North Korea," McCain's office said on Monday evening. McCain was absent last week after having a blood clot removed from above his left eye, and it was unclear earlier Monday if he would return for...