It is also what worries some U.S. lawmakers back in Washington.

这也是华盛顿的一些美国立法者所担心的。

Inside Merrill Lynch and AIG, senior executives worried as far back as 2005 and 2006 about their firms' exposure to the mortgage market.

美林证券和AIG的高管们早在2005年、2006年时就已经开始担心公司涉足抵押贷款市场将会带来隐忧。