Lawmakers have urged the chairman of Ameriquest Capital Corp. to get more involved in negotiating a deal with state attorneys general that would put to rest claims that the lender used bait-and-switch tactics to trick borrowers into taking high-price mortgage loans. The call for action came early and often during last week’s confirmation hearing of Ameriquest Chairman Roland Arnall, who has been tapped by the Bush administration to be its ambassador to the Netherlands. …