Battle brews in House Oversight panel

House Oversight Committee Chairman Darrell Issa, R-California, right, talks with ranking Democratic member Elijah Cummings of Maryland before what turned out to be a contentious hearing on the IRS targeting of political groups.

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    Battle brews in House Oversight panel

CNN's Kate Bolduan talks to ranking member Elijah Cummings about his tense relationship with Chairman Darrell Issa.