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They also argued against releasing any information on the basis of a constitutional clause that immunizes members of Congress from lawsuits arising from their legislative work.

Senate attorneys argued that Mr. Blumenthal served on the Senate Judiciary Committee, which oversees labor laws, so information he received about the labor dispute in Connecticut is protected from release.

The litigation has pried loose some emails revealing behind-the-scenes communications between Mr. Blumenthal’s office and union officials.

In one exchange, a Blumenthal staffer said his boss couldn’t attend an event at a nursing home as workers returned to their jobs last year.

“By the way, Dick cannot make the 630 start on Sunday,” the staffer wrote to a union official. “He was wondering if you would do a similar event for the second shift? Maybe more likely to get press.”

“Fabulous,” the union official replied.