Covering a Candidate Who's Declared War on the Press

Despite the hours of free media that fueled his candidacy, Donald Trump is attacking the media – which then gave him even more time.

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Mark Halperin and John Heilemann are co-hosts of The Circus,a series on Showtime that will be back on the air in July in the heat of the campaign. The pair, who are also the authors of Game Change and co-managing editors at Bloomberg Politics, discuss this unprecedented challenge to political journalism.