A group of 20 U.S. senators, including Minnesota’s Al Franken, sent a letter to Department of Education Secretary Arne Duncan last week asking him to assist in closing a loophole that allows for-profit colleges to count GI Bill benefits as nonfederal funding in their revenue breakdowns. It’s called the 90/10 rule. It’s intended to cap federal funding for for-profit colleges at 90 percent of their revenue. The other 10 percent needs to come from sources other than the federal government. But right now, tuition assistance for service members and the GI Bill are not included in the calculation. The letter raises concerns that active-duty service members and veterans have been targeted by some for-profit colleges because of the attractiveness of access to their GI Bill funding. Among the top for-profit recipients of Post-9/11 GI Bill funds, seven of the eight companies are currently under investigation for deceptive and misleading recruiting or other possible violations of state and federal law. ….