Case could create different citizenship rules in different states while legal challenges continueAs the US prepares for what could be another record-breaking hot summer, Donald Trump and his pick to lead the nation’s workplace safety agency are expected to derail the creation of the nation’s first-ever federal labor protections from extreme heat.Trump in February nominated David Keeling to lead the Occupational Safety and Health Administration (Osha). Keeling formerly served as an executive at the United Parcel Service (UPS) and Amazon – both of which have faced citations from Osha for worker injuries and deaths amid heat exposure. The companies deny