U.S. Sens. Amy Klobuchar and Al Franken both signed a letter Wednesday urging President Obama to make "a sizable and sustained drawdown" of U.S. combat troops from Afghanistan this summer. The two Minnesota Democrats were among 27 senators who sent a letter to the White House, which faces a self-imposed July deadline to start troop withdrawals. "When we started the surge in Afghanistan, the President said we would start drawing down our troops this July and we're holding him to that," Franken said in a statement. "There won't be a precipitous withdrawal, but our commitment isn't open-ended and unconditional." Other than Republicans Mike Lee of Utah and Rand Paul of Kentucky, along with Vermont Independent Bernie Sanders, all the signatories were Democrats.