today sources inside congress and the obama administration are telling cnn president obama has decided to bring 30,000 u.s. troops home from afghanistan. he's making the announcement tomorrow night at 8:00 eastern during a speech you can see right here on cnn. 30,000 is a little under one-third of the 100,000 troops there now. but it won't happen quickly. we're told 10,000 will come out this year by the rest of the end of 2012. another source says the pentagon argued for an even smaller drawdown. but robert gates says he understands the president's decision. >> the president has to take into account on any national security issue sustainability here at home both among the public and in the congress. and it goes without saying that there are a lot of reservations in congress about the war in afghanistan and our level of commitment. there are concerns among the american people who are tired of a decade of war.