washington u.s. senate arm service committee chairman john mccain say monday back president-elect donald trump criticism cost lockheed martin f-35 fighter jet program say president authority cancel fund already appropriate interview reuters mccain lead republican voice national security outspoken critic pentagon cost overrun say however trump would power reduce future purchase new-generation fighters decide reduce buy time next year look mccain say right acquisition lot already take place happy say fixed-price contract president sure examine it exclusive mccain back trump criticism f-35 say president ca n't cancel