Uber CEO Travis Kalanick has resigned from President Trump’s business advisory council amid fierce blowback against the recent executive order on immigration, and in the wake of reports that several major Silicon Valley firms, including Facebook, Apple, Microsoft and Google, have been circulating a draft letter opposing Trump’s action. Kalanick said he no longer would participate in the council after consumers railed against Uber for continuing to operate at JFK International Airport over the weekend in spite of a strike by taxi drivers.