The Senate voted Tuesday to confirm Nikki Haley as ambassador to the United Nations, making her the fourth member of President Donald Trump’s Cabinet to be approved even as Republicans and Democrats battle angrily over the pace of confirmations. Republicans are upset at what they complain is a deliberate effort by Democrats to slow walk approval of Trump’s top government executives and argue the GOP was much more cooperative when President Barack Obama got seven Cabinet members confirmed on the day he was sworn in back in 2009.