Brynn Catherine was born Sunday morning, and weighed 7 pounds, 6 ounces.
McMorris Rodgers' office says mom and daughter are doing very well.
A Republican who represents Eastern Washington, McMorris Rodgers gave birth to a son in 2007 and a daughter in 2010. Her office says she is the first politician to give birth three times while serving in Congress.
McMorris Rodgers' office says she looks forward to remaining in Congress and as a member of House Republican leadership.
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