WASHINGTON — An aviation bill Congress is rushing to approve contains a little-noticed section that would give authorities the power to track, intercept and destroy drones they consider a security threat, without needing a judge’s approval. Supporters say law enforcement needs this power to protect Americans from terrorists who are learning how to use drones as deadly weapons. They point to the Islamic State terrorist group’s use of bomb-carrying drones on battlefields in Iraq, and warn that terrorists could go after civilian targets in the United States. Critics say the provision would give the government unchecked power to decide when drones are a threat.