Washington — The FBI's criminal investigation of the Internal Revenue Service could include potential civil rights violations, false statements and potential violations of the Hatch Act, which prohibits federal employees from engaging in some partisan political activities, Attorney General Eric Holder said Wednesday.

Holder, testifying to the House Judiciary Committee, was asked what criminal charges could be pursued against IRS employees or officials. Holder announced on Tuesday that the Justice Department was the investigating the IRS after the agency acknowledged that agents had singled out conservative groups for extra scrutiny when they applied for tax-exempt status.

"I can assure you and the American people that we will take a dispassionate view of this," Holder said. "This will not be about parties, this will not be about ideological persuasions. Anybody who has broken the law will be held accountable."

Holder also says it will take time to determine if there was criminal wrongdoing.

As the investigation widened, House Speaker John Boehner told reporters he had this question: "Who's going to jail over this scandal?"

"There are laws in place to prevent this type of abuse. Someone made a conscious decision to harass and to hold up these requests for tax-exempt status," Boehner said. "I think we need to know who they are and whether they violated the law. Clearly someone violated the law."

Wednesday's hearing was the first of several in Congress that will focus on the issue.

Under mounting pressure, President Barack Obama on Wednesday released a trove of documents related to the Benghazi attack and forced out the top official at the Internal Revenue Service following revelations that the agency targeted conservative political groups. The moves were aimed at halting a perception spreading among both White House opponents and allies that the president has been passive and disengaged as controversies consume his second term.

In another action, the White House asked Congress to revive a media shield law that would protect journalists from having to reveal information, a step seen as a response to the Justice Department's widely criticized subpoenas of phone records from reporters and editors at The Associated Press.

The flurry of activity signaled a White House anxious to regain control amid the trio of deepening controversies. The incidents have emboldened Republicans, overshadowed Obama's legislative agenda and threatened to plunge his second term into a steady stream of congressional investigations.

Standing in the East Room of the White House, the president said Acting IRS Commissioner Steven Miller had resigned and vowed that more steps would be taken to hold those responsible accountable.

"Americans have a right to be angry about it, and I am angry about it," Obama said of the IRS actions. "I will not tolerate this kind of behavior at any agency, but especially at the IRS given the power that it has and the reach that it has into all of our lives."

Obama had addressed the IRS matter on Monday, but his measured words left many unsatisfied, particularly given that he had waited three days to address the developments. He also repeatedly asserted that he was waiting to find out if the reports were accurate, even though top IRS officials had already acknowledged the controversial actions.

Adding to narrative of a passive president were White House efforts to distance Obama from the IRS scandal, as well as the revelations that the Justice Department had secretly obtained work and personal phone records of journalists. In both cases, the White House insisted the president had no prior knowledge of the events and learned about the matters like the general public - from news reports.

Obama's cautious response, combined with his lack of awareness about controversies brewing within his administration, opened him to quick criticism from his Republican foes.

"If Obama really learned about the latest IRS and AP secret subpoena scandals in the news, who exactly is running the ship at the White House?" Republican National Committee spokesman Kirsten Kukowski said.

But in a worrying sign for the White House, some Democrats also criticized the president for not being more aggressive in responding to trouble within the government.

Robert Gibbs, Obama's former White House press secretary, said the president should have appointed a bipartisan commission of former IRS officials to look into the issue of targeting political organizations. And Gibbs gently chided his former boss for using passive language when he first addressed the political targeting during a White House news conference Monday.

"I think they would have a much better way of talking about this story rather than simply kind of landing on the, "well if this happened, then we'll look at it'," Gibbs said during an appearance on MSNBC.

The pair of new fresh controversies coincided with a resurgence in the GOP-led investigation into the Sept. 11, 2012, attacks on a U.S. compound in Benghazi, Libya, that killed the U.S. ambassador and three other Americans.

Congressional Republicans launched another round of hearings on the attacks last week. And on Friday, a congressional official disclosed details of emails among administration officials that resulted in the CIA downplaying the prospect that the attacks were an act of terror in talking points used to publicly discuss the deadly incident.

Obama aides insisted the emails were either taken out of context or provided no new information but resisted pressure to make the emails public for five days, before finally disclosing the documents to reporters Wednesday. The emails revealed that then-CIA Director David Petraeus disagreed with the final talking points, despite the White House's insistence that the intelligence agency had the final say over the statements.

The White House has publicly defended its handling of the controversies. Obama spokesman Jay Carney has insisted it would be "wholly inappropriate" for the president, in the case of the Justice Department matter, to weigh in on an active investigation, and in the case of the IRS controversy, to insert himself in the actions of an independent agency.