New Jersey Governor Christie: 'We let down the people'
14 January 2014 Last updated at 21:24 GMT
Embattled New Jersey Governor Chris Christie has pledged to co-operate with inquiries into a series of scandals threatening his political future.
It has been revealed his senior staff orchestrated a severe traffic jam at the foot of a major bridge in an act of apparent political payback.
"We let down the people we are entrusted to serve," he said in a major speech, referring obliquely to the row.