Members of the Senate Finance Committee blasted the head of the Internal Revenue Service Tuesday for problems still lingering within the agency more than two years after the targeting controversy came to light.

Commissioner John Koskinen denied suggestions that the IRS had ever scrutinized conservative groups for political reasons, citing the Justice Department's decision last week to close its investigation without pressing criminal charges.

The heated hearing highlighted the divide that still exists between Republicans and Democrats over whether the IRS ever actually targeted conservatives in the run-up to President Obama's 2012 re-election.

Sen. Orrin Hatch, chairman of the Finance Committee, praised the bipartisan report his panel released in August for putting forward suggestions on how to improve the tax agency.

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