WASHINGTON — The Supreme Court on Monday questioned whether an ex-aide to former New York Gov. Andrew Cuomo was lawfully convicted on a bribery charge as it considered two cases that could place new limits on federal prosecutors in public corruption cases. The first case centered on whether Joseph Percoco’s conduct in taking a $35,000 payment from a real estate developer when managing Cuomo’s re-election campaign in 2014 is covered by a federal law that requires that “honest services” be provided to the public. Percoco says that because he was not working for the government at the time, he had...