President Obama's plan is expected to call for as many as 40,000 more troops, as requested by war Cmdr. Gen. Stanley McChrystal.
Approximately 68,000 U.S. troops are already in Afghanistan.
Mark Moyar, a professor at the U.S. Marine Corps University in Quantico, Va., explained to ABC7 Chicago why he thinks a troops surge is necessary.
" We're trying to prevent it, above all, from becoming a safe haven for insurgents to launch another attack like 9/11 or some other attack on the U.S. homeland. We need to create Afghan security forces that can control the country, ultimately, without American forces, and by sending more resources, we can help them do that," Moyer said.
Another supporter is Republican Sen. Lindsey Graham of South Carolina, who's on the Armed Services Committee. He says U.S. national security future depends on "getting it right in Afghanistan."
Graham says Obama is right in his assessment that the war in Afghanistan must be won.
But Sen. Bernie Sanders wants more countries to help out in Afghanistan. The Vermont independent also worries about the rising war costs.