Estimates by the Congresssional Budget Office in January 2011 show the federal budget deficit in the US at nearly $1.5 trillion in 2011. The deficit would equal 9.8% of the US gross domestic product. In 2009 the budget deficit was $1.4 trillion or 10% of GDP. The CBO estimates show the debt held by the public increasing from 40% of GDP at the end of fiscal year 2008 to about 70% at the end of fiscal year 2011. Republican senators Orrin Hatch of Utah and John Cornyn of Texas called for a constitutional balanced budget amendment in an op-ed published in Politico.