Overcoming Foreign-Policy Disunity - Richard G. Lugar

Unfortunately, neither the George W. Bush White House nor the Obama White House showed much interest in a foreign-policy partnership with Congress. This contrasts with the Reagan, George H. W. Bush, and Clinton Administrations, all of which placed a much higher value on Congressional participation in foreign policy. - .Overcoming Foreign-Policy Disunity - The National Interest
America's Flawed and Fragile Democracy - Paul R. Pillar