Washington (CNN) - House Speaker John Boehner said Rep. Darrell Issa was justified in ending an acrimonious hearing on IRS targeting of conservative groups - a meeting concluded when Issa cut the hearing room microphones with his harshest critic on the panel, Rep. Elijah Cummings, in mid sentence.

"From what I understand, I think Mr. Issa was in his rights to adjourn the hearing," Boehner told reporters on Thursday.

The Congressional Black Caucus wants Issa removed as House Oversight Committee chairman following Wednesday's uproar, which it sees as the latest in a series of disrespectful responses to pushback from Democrats during hearings on the IRS matter.

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