President Barack Obama has said US tax collection agency’s targeting of conservative groups for extra scrutiny before an election was “outrageous”. At the White House, Mr Obama said the Internal Revenue Service (IRS) needed to operate with “absolute integrity”.Groups with the words “Tea Party” or “patriot” in their names were singled out, the tax agency has acknowledged. He also said criticisms of the response to an attack on a US mission in Libya last year were politically motivated, BBC informs. Official talking points about the 11 September assault against the diplomatic facility in Benghazi, in which four Americans died, were edited by the state department to remove references to terrorism, it has been revealed. Republicans have alleged the Obama administration sought to downplay terrorism ahead of the November presidential election.At a White House news conference on Monday alongside UK Prime Minister David Cameron, Mr Obama said the IRS had to be held “fully accountable” if it had singled out tax-exempt groups for political reasons during the 2012 election campaign. He said US taxpayers had to have confidence the tax agency was applying the law in a non-partisan fashion. “You don’t want the IRS ever being perceived to be biased and anything less than neutral,” Mr Obama said. “This is something that I think people are properly concerned about.