WASHINGTON — The Securities and Exchange Commission is defending its antifraud authority over certain interest-rate swaps and urging a federal judge not to dismiss its suit against two former JPMorgan bankers for allegedly making more than $8 million in undisclosed payments to secure swaps for the firm with Jefferson County, Ala.

The SEC made its appeal in a response brief filed Tuesday in a federal court in Birmingham, about three weeks after the two former bankers, Charles LeCroy and Douglas MacFaddin, asked the court to dismiss the suit, which the commission filed against them in November.

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