WASHINGTON — President Trump put forward on Monday a long-awaited strategy for resolving the nearly 16-year-old conflict in Afghanistan, but he declined to specify either the number of troops that would be committed, or the conditions by which he would judge the success of their mission there.
In a nationally televised prime-time speech to troops at Fort Myer, Va., Mr. Trump said there would be no “blank check” for the American engagement in Afghanistan. But in announcing his plan, Mr. Trump deepened American involvement in a military mission that has bedeviled his predecessors and that he once called futile.
“My original instinct was to pull out, and historically I like following my instincts,” Mr. Trump said. “But all my life, I’ve heard that decisions are much different when you sit behind the desk in the Oval Office.”
After what he described as a lengthy and exhaustive deliberation culminating in a meeting with his war cabinet at Camp David, Mr. Trump said that he had been convinced that “a hasty withdrawal would create a vacuum for terrorists, including ISIS and Al Qaeda.”
Speaking to a military audience at a base outside Washington, Mr. Trump declared, “In the end, we will win.”