WASHINGTON (AFP) - President Barack Obama's plan to send 100 military troops to Uganda risks miring the United States in another protracted war, a top Republican lawmaker warned on Sunday. Senator John McCain said that with almost 100,000 US troops in Afghanistan and the drawdown from Iraq still not complete, Obama's plan to send troops to act as military advisers for Ugandan government forces fighting the rebel-led Lord's Resistance Army was ill-advised. "I worry (that) with the best of intentions we'll somehow get engaged in a commitment that we can't get out of. That's happened before in our history," he told CNN television.