WASHINGTON >> The number of people charged with breaking federal drug laws dropped to the lowest level in decades this year after the Trump administration ordered enforcement agencies to focus on deporting immigrants, a Reuters review of nearly 2 million federal court records found. He ordered thousands of federal agents to focus on fending off what he described as an “invasion” of illegal immigration. “You cannot conduct thorough, multi-agency drug investigations if you’re running around doing this other stuff,” said a former U.S. Drug Enforcement Administration official who supervised its shift to immigration enforcement. The Trump administration has promised repeatedly to take a tougher approach to drug enforcement. This summer, Trump ordered hundreds of federal agents to patrol Washington, D.C., to combat what he described as a crisis of violent crime in the capital.