FBI Director James Comey says police restraint, born from increased scrutiny in the wake of high-profile police killings and evidence of racial bias, may be contributing to an uptick in violent crimes in some cities. Andrew Harnik/AP hide caption

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Former Deputy Attorney General James B. Comey waits to testify before the Senate Judiciary Committee in Washington on May 15, 2007. NPR has learned that Comey is in line to become President Obama's choice as the next FBI director. Susan Walsh/AP hide caption

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President Obama is expected to nominate James Comey, seen in 2004, to be the next director of the FBI. Mark Wilson/Getty Images hide caption

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Former Deputy Attorney General James B. Comey waits to testify before the Senate Judiciary Committee in Washington on May 15, 2007. NPR has learned that Comey is in line to become President Obama's choice as the next FBI director. Susan Walsh/AP hide caption

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