U.S. Attorney General Jeff Sessions overstepped his bounds by threatening to unilaterally withhold federal grant money from so-called sanctuary cities, a lawyer for the city of Chicago argued today.Ronald S. Safer of Riley Safer Holmes & Cancila LLP contended Congress did not give the U.S. Justice Department the authority to impose additional conditions on the receipt of public safety funds from the Edward Byrne Memorial Justice Assistance Grant.Other attorneys representing the city include Corporation Counsel Edward N …