Federal immigration officers have been seen at several U.S. airports on Monday after the Trump administration said it would deploy ICE agents to ease security lines amid an ongoing partial government shutdown. The shutdown, which began on February 14, has resulted in long lines at airport pre-gate security checkpoints, typically handled by Transportation Security Administration (TSA) agents. Since the shutdown, hundreds of thousands of agents under the Department of Homeland Security, including TSA, have worked without pay because Congress failed to pass new funding.  Democrats are calling for changes to federal immigration operations after reports of abuse by agents, including the killing of two U.S. citizens earlier this year. In recent days, travelers have filmed lines with wait times estimated at several hours. Trump border czar Tom Homan told CNN that ICE agents would be deployed starting Monday to airports with the longest wait times. Homan said details of the plan were still under discussion.…