On Tuesday, I’ll be on the Diane Rehm Show to discuss separation of powers with Michael Quinn, president of James Madison’s Montpelier Foundation (which, as my family and I discovered on a visit last year, has done an excellent job restoring Madison’s home), and American University law professor Amanda Frost. The segment will run from 11 a.m. to noon ET. (The show, distributed by NPR, is broadcast on public radio stations throughout the country.)