Trump to undo Obama auto emissions rules: official

President Donald Trump is set to announce steps Wednesday to halt his predecessor Barack Obama's future vehicle emissions limits for manufacturers, a senior administration official said.During a visit to auto manufacturing hub Detroit, Trump is set to announce that the Environmental Protection Agency's objectives for 2022-2025 will be put on hold during a new review period."We are going to hold back the EPA determination" that automakers can meet the Obama administration's strict curbs on greenh