WASHINGTON (AP) — A Republican senator says she's disappointed that President Barack Obama hasn't personally condemned the Internal Revenue Service's targeting of conservative political groups during the 2012 election.

Sen. Susan Collins of Maine says Obama "needs to make crystal clear that this is totally unacceptable."

The agency blames low-level employees and says no senior officials were aware of the extra scrutiny to see if conservative groups were violating their tax-exempt status.

But a draft of a watchdog's report obtained Saturday by The Associated Press says senior officials knew agents were targeting tea party groups as early as 2011.

Collins tells CNN's "State of the Union" she doesn't "buy that this was a couple of rogue IRS employees."

She says the targeting is "absolutely chilling" and contributes to the public's "distrust" in government.

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