Nadine Menendez, the wife and co-defendant of Sen. Robert Menendez, has been diagnosed with breast cancer, the Democratic lawmaker revealed Thursday during his trial on federal corruption charges. “As a result of constant press inquiries and reporters following my wife, she has asked me to disclose her medical condition," Menendez, the senior senator from New Jersey, said in a statement his office shared with NBC News. "Nadine is suffering from Grade 3 breast cancer, which will require her to have mastectomy surgery. We are, of course, concerned about the seriousness and advanced stage of the disease," Menendez said. "Sh