ABC News' Ariane de Vogue reports: Conservative Rep. Michele Bachmann, R-Minn., kicks off her Constitutional seminar for members of the House of Representatives on Monday with a class taught by none other than Supreme Court Justice Antonin Scalia. Scalia will deliver a closed door lecture on the separation of powers. In a statement, Bachmann's office says she is "delighted" that Scalia agreed to be the first speaker for the event. "It is a special privilege to have him address the first of what will be regular seminars featuring constitutional scholars," said Bachmann. She has previously said the seminars will be available to all members of Congress. But the liberal American Constitution Society is concerned that Bachmann labels the classes "Conservative Constitutional Seminars." The group sent a letter today to Bachmann and House Speaker John Boehner offering to make available other experts who might "expand the scope of the conversation." This is not the first time a Supreme Court Justice has gone to the hill to talk about the Constitution. In 2003, Reps. Judy Biggert, R-Ill., and Adam Schiff, D-Calif., launched the Congressional Caucus on the Judicial Branch to strengthen relations between Congress and the Judiciary. The group has hosted off-the-record exchanges with several Supreme Court Justices, including Justice Sonia Sotomayor earlier this year.