US officials: Obama to announce sending more troops to Afghanistan

US President Barack Obama is sending in 4,000 more US military trainers to Afghanistan to build up that country's own forces and shift greater responsibility to them, senior administration sources said Friday. The sources said Obama's goal is to stabilize Afghanistan and eliminate the terrorist havens that have taken root in Pakistan. The plan is built around benchmarks that will allow the president and Congress to check whether the investment of more US people and aid is working, they explained.. They also say the new plan, which Obama is expected to announce Friday, has no timeline for a withdrawal of US forces.