President Obama is set to defend U.S. military involvement in Libya to Congress as soon as today, according to the White House.

Congressional sources are expecting a written report answering a number of questions the House of Representatives posed in a resolution passed with bipartisan support over a week ago, including inquiries about the president’s goal in Libya, how he hopes to achieve that goal, why he has not sought congressional authorization for involving U.S. troops abroad and how much the conflict will ultimately cost.

White House spokesman Tommy Vietor said the report “will address a whole host of issues about our ongoing efforts in Libya, including those raised in the House resolution as well as our legal analysis with regard to the War Powers Resolution.”

Many members of congress – Democrats and Republicans – accuse the president of flouting the War Powers Resolution, which says the president can involve U.S. troops abroad for 60 days without congressional authorization but must withdraw them within another 30 days without a congressional okay.

The White House maintains it is acting in accordance with the law.

The report to congress follows a letter Speaker John Boehner sent to President Obama Tuesday warning him that he will be in violation of the War Powers resolution come Friday, 90 days after U.S. involvement in the Libya conflict began, though Vietor says the response was already in the works ahead of Boehner’s letter to the president.