Mr Bonnard, who was suspended when he was arrested in 2011 as part of corruption inquiry Operation Sacristy, has denied any wrongdoing.
Doug Suttles, chief operating officer of BP's exploration and production division, denied the operation had failed and said the company was trying to figure out a way of providing heat at a depth of 5, 000 feet to melt the crystals.
Both spokesmen denied that the operation had been ordered by the three cardinals, saying that if it had happened, it was ordered by magistrates.
CNN: 'I'm just a pilgrim,' Benedict XVI says in public farewell
The officer in charge of the police operation at Belfast City Hall has denied police were caught "on the hop" by rioting.
When Congress originally asked the Justice Department about the operation last year, it first denied that the ATF had permitted any smuggling to proceed before reversing itself ten months later.
Specifically, Issa's panel is seeking documents showing why the Justice Department decided to withdraw as inaccurate a February 2011 letter sent to Congress that denied any major flaws in Operation Fast and Furious.
Specifically, Issa and other Republicans are seeking documents showing why the Justice Department decided to withdraw as inaccurate a February 2011 letter sent to Congress that denied any major flaws in Operation Fast and Furious.
At the time, Mr Coulson denied any knowledge of a wider hacking operation.
Lombardi denied there had been "a massive" operation on the scale reported by the magazine, saying there is "no foundation" for the article.
CNN: 'I'm just a pilgrim,' Benedict XVI says in public farewell
All domestic and legal visitors had been denied access to Maghaberry prison since Thursday morning, when the search operation began.
Mr Christie has already said he will run for a second term as governor in November, but denied that thoughts of running for the presidency had led him to have the operation.
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