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DAVENPORT, IA - DECEMBER 05:  Republican presidential candidate Donald Trump speaks to guests gathered for a campaign event at Mississippi Valley Fairgrounds on December 5, 2015 in Davenport, Iowa. Trump continues to lead the most polls in the race for the Republican nomination for president.  (Photo by Scott Olson/Getty Images)
DAVENPORT, IA - DECEMBER 05:  Republican presidential candidate Donald Trump speaks to guests gathered for a campaign event at Mississippi Valley Fairgrounds on December 5, 2015 in Davenport, Iowa. Trump continues to lead the most polls in the race for the Republican nomination for president.  (Photo by Scott Olson/Getty Images)

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The GOP is bracing for a battle in Cleveland next July and a possible brokered convention. CNN's Tom Foreman has the details.

What is a brokered convention?

The GOP is bracing for a battle in Cleveland next July and a possible brokered convention. CNN's Tom Foreman has the details.