Since the series aired, thousands of people signed petitions to Barack Obama asking him to pardon Avery, a request the President denied, saying the case was a federal issue.
Although this sentence seems to be easy to understand I am a little bit confused. In my opinion it asserts that the president of the USA cannot pardon Steven Avery because his case is a federal issue. But it contradicts to the statement which was made by the White House regarding the pardon in Steven Avery case and in which is written: "This clemency authority empowers the President to exercise leniency towards persons who have committed federal crimes. (…) However, the President cannot pardon a state criminal offense." So I either do not understand the above sentence or there is a factual mistake in the article. Can you provide me clarification?