A key plank of President Donald Trump’s program to deport illegal immigrants is expected to reach the nation’s highest court. The policy in question allows authorities to detain illegal immigrants who have been in the country for years, and do so without releasing them on bond. Adopted last year, it represented a change from how previous administrations interpreted a specific provision of the Immigration and Nationality Act (INA). It also led to a flood of lawsuits from immigrants challenging detention. Legal experts have speculated that the justices would intervene after several appeals courts issued conflicting interpretations of the law. The result was a patchwork of enforcement across the country, raising questions about how millions of illegal immigrants would be detained....