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(Reuters) – The U.S. Homeland Security Department’s inspector general said on Friday he was investigating possible abuse of authority in a case that triggered a lawsuit against the department by Twitter.

Inspector General John Roth described the probe in a letter to Senator Ron Wyden, an Oregon Democrat who had asked for an investigation due to concerns about free speech protections.

In a lawsuit on April 6, Twitter disclosed that it received a summons in March from the U.S. Bureau of Customs and Border Protection, an agency within Homeland Security, demanding records about an account on the social media platform identified by the…