who was in charge when all this happened.

http://livewire.talkingpointsmemo.com/entry/rubio-calls-on-irs-commissioner-to-resign?ref=fpb

Rubio Calls On IRS Commissioner To Resign

Sen. Marco Rubio (R-FL) on Monday called on the IRS commisioner to resign in the wake of the agency's admission that staffers in the Cincinatti branch targeted conservative political groups for extra scrutiny in the run-up to the 2012 elections.

"t is clear the IRS cannot operate with even a shred of the American people’s confidence under the current leadership," Rubio wrote in a letter to Treasury Secretary Jack Lew. "Therefore, I strongly urge that you and President Obama demand the IRS Commissioner’s resignation, effectively immediately. No government agency that has behaved in such a manner can possibly instill any faith and respect from the American public."

Commissioner Douglas H. Shulman, who was appointed by President Bush in 2008 and held by President Obama, left the agency in Nov. 9, 2012. Any pre-election misconduct would have had to occur on his watch. The current acting commissioner is Steven T. Miller -- a permanent replacement has not been nominated.

In response to TPM's query, Rubio's spokesman Alex Conant noted that Miller was deputy commissioner when the misconduct took place. He did not suggest the IRS acted inappropriately under Miller's watch as acting commissioner.

(end snip)

The IRS, much like Benghazi, is turning into a great big OOPS for the GOPers.

at the IRS that was previously going on under a Republican appointee?

Even when Republicans fuck up, they demand that others get blamed.

Rubio better hope no one asks him to explain his reasoning on this.