The Justice Department said in court Wednesday that Attorney General Jeff Sessions made an “error” in his memo laying out the legal problems with the Obama-era DACA program, as a federal judge repeatedly blasted the Trump administration for weak reasoning in revoking the deportation amnesty. Government lawyers say the error isn’t enough to sink their case, arguing Deferred Action for Childhood Arrivals program is unlawful and the risks of trying to defend it in court were enough to justify the six-month phase out the acting Homeland Security secretary initiated last year.