Lawyers for former Senator John Edwards said his client committed "many sins but no crimes" and said the charges against him should never have been brought to trial.
Edwards was found not guilty of one count of campaign fraud, and the jury were unable to reach a verdict on the remaining five counts, forcing the judge to declare a mistrial.
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The prime minister says she has proven the "doubters" wrong but still faces opposition from both sides of the Brexit line.
Defence saving plans raise "serious doubts" over the Ministry of Defence's ability to pay for new equipment, including warships and planes.