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“The case has come under scrutiny by members of Congress because it was abruptly dismissed without explanation when the Obama administration took over the Justice Department,” he said.

Acting Assistant Attorney General Loretta King and Steve Rosenbaum, chief of the department’s special litigation section, were scheduled to brief Mr. Smith and House Judiciary Committee Chairman John Conyers, Michigan Democrat, on Friday.

The Times reported on Thursday that Mr. Perrelli, the No. 3 official at Justice, approved a decision in May to drop a civil complaint accusing three members of the New Black Panther Party of intimidating voters in Philadelphia during November’s election.

Career lawyers in the Voting Section of the Civil Rights Division, who pursued the complaint for five months, had recommended that the department seek sanctions against the party and three of its members after the government won a default judgment in federal court.

The front-line lawyers were in the final stages of completing that work when they were told by superiors in late April to seek a delay after a meeting between political appointees and career supervisors, according to federal records and interviews.

The delay was ordered by Ms. King after discussions with Mr. Perrelli, according to Justice Department officials. Ms. King and other career supervisors ultimately recommended dropping the case against two of the men and the party and seeking a restraining order against the one man who wielded a nightstick. Mr. Perrelli approved that plan, the officials said.

Justice Department spokeswoman Tracy Schmaler said the department has an “ongoing obligation” to be sure the claims it makes are supported by the facts and the law. She said that after a “thorough review” of the complaint, top career attorneys in the Civil Rights Division determined the “facts and the law did not support pursuing the claims against three of the defendants.”

“As a result, the department dismissed those claims,” she said. “We are committed to vigorous enforcement of the laws protecting anyone exercising his or her right to vote.”

Ms. Schmaler also said the department has tried to cooperate with Congress and agreed to a meeting with Mr. Wolf and career attorneys “in which they made a good-faith effort to respond to his inquiries about this case. We will continue to try to clear up any confusion Congressman Wolf has about this case.”

Mr. Smith and Mr. Wolf have been joined in their call for an investigation of the matter by other Republican lawmakers, including Rep. Jim Sensenbrenner of Wisconsin, Rep. Steve King of Iowa, Rep. Trent Franks of Arizona and Rep. Louie Gohmert of Texas.