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Why is Donald Trump condemning the GOP nomination process?

Name: Why is Donald Trump condemning the GOP nomination process?
Uploaded: 2016-04-12T12:10:30-0400
Duration: 3 min 49 s
Description: Donald Trump has called the Republican nomination process a "rigged...dirty system". His rivals are changing their campaign strategy to guarantee a contested convention in Ohio. With analysis on the GOP race, The Washington Post's Philip Bump and Politico's Steven Shepard join CBSN.

Donald Trump has called the Republican nomination process a "rigged...dirty system". His rivals are changing their campaign strategy to guarantee a contested convention in Ohio. With analysis on the GOP race, The Washington Post's Philip Bump and Politico's Steven Shepard join CBSN.