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NEW YORK, NY - SEPTEMBER 28:  Republican presidential candidate Donald Trump gives a speech outlining his vision for tax reform at his skyscraper on Fifth Avenue on September 28, 2015 in New York City. Under the plan there would be four tax categories, with people earning less than $25,000 per year paying 0% tax.  (Photo by Andrew Burton/Getty Images)
NEW YORK, NY - SEPTEMBER 28:  Republican presidential candidate Donald Trump gives a speech outlining his vision for tax reform at his skyscraper on Fifth Avenue on September 28, 2015 in New York City. Under the plan there would be four tax categories, with people earning less than $25,000 per year paying 0% tax.  (Photo by Andrew Burton/Getty Images)

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Rivals trash Donald Trump's tax plan

Other Republican presidential candidates speak out against Donald Trump's proposed tax plan. CNN's Dana Bash reports.

Rivals trash Donald Trump's tax plan

Other Republican presidential candidates speak out against Donald Trump's proposed tax plan. CNN's Dana Bash reports.