The chairman of the Senate Armed Services Committee is blasting the Navy’s expensive new warships that have been plagued by engine problems and have yet to demonstrate key warfighting functions. Sen. John McCain, R-Ariz., a Navy fighter pilot in the Vietnam War, said the $12.4 billion spent for 26 littoral combat ships is the most egregious example of what he calls “America’s Most Wasted: Indefensible,” the latest in a series of reports on wasteful spending by the Pentagon.