A second federal judge has taken the rare step of allowing a group suing for records from Hillary Clinton's time as U.S. secretary of state to seek sworn testimony from officials, saying there was "evidence of government wrong-doing and bad faith."

The language in Judge Royce Lamberth's order undercut the Democratic presidential contender's assertion she was allowed to set up a private email server in her home for her work as the country's top diplomat and that the arrangement was not particularly unusual.

He described Clinton's email arrangement as "extraordinary" in his order filed on Tuesday in federal district court in Washington.

Referring to the State Department, Clinton and Clinton's aides, he said there had been "constantly shifting admissions by the Government and the former government officials."

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