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By Susan Cornwell WASHINGTON (Reuters) - An email leak that led to the resignation of Democratic National Committee Chairwoman Debbie Wasserman Schultz could plague her bid for re-election to Congress, after a challenger said on Monday he would file a complaint alleging she had broken election rules. Political newcomer Tim Canova, who is challenging Wasserman Schultz in the Aug. 30 Democratic primary for her House of Representatives seat representing Florida's 23rd Congressional District, said he would file the complaint against her with the U.S. Federal Election Commission. Wasserman Schultz said on Sunday she would be stepping down as chairwoman of the Democratic National Committee after Wikileaks released more than 19,000 emails showing Democratic officials had worked to undermine U.S. Senator Bernie Sanders in his presidential primary battle with Hillary Clinton.