NEW : House Democrats struggle to maintain liberal support for Afghan war . Washington has pressed Karzai to clean up alleged corruption in the government . Obama accepts resignation of U.S. commander of Afghan war after explosive comments . Obama pressed Afghan president to clean up alleged corruption in the government . Afghanistan has been a source of instability and violence since Taliban was ousted from power by U.S.-led coalition forces in 2001. U.S. troops in Iraq will reduce to between 35,000 and 50,000 by August 31 .
NEW : House Democrats struggle to maintain liberal support for Afghan war . Obama accepts resignation of U.S. commander of Afghan war after explosive comments . Obama pressed Afghan president to clean up alleged corruption in the government . Afghanistan has been a source of instability and violence since Taliban was ousted from power by U.S.-led coalition forces in 2001. U.S. troops in Iraq will reduce to between 35,000 and 50,000 by August 31 .