In June 2011, a bipartisan group of members of U.S. House of Representatives objected to the refusal of the Obama administration to obtain Congressional approval in line with the War Powers Act of 1973 for the U.S. military’s continued involvement in Libya. On June 17, 2011, The New York Times ran a story which indicated that Barak Obama had gone against the views of the top lawyers at the Justice Department and the Pentagon in his decision not to seek Congressional approval.
The full essay is at "President Obama and the War Powers Act."
