If President-elect Donald Trump and a Republican Senate try to roll back reproductive health rights or pursue a widely prophesied national abortion ban, California Attorney General Rob Bonta is poised to challenge him. Two years ago, Bonta, a Democrat who heads the state justice department, directed his staff to draft legal analyses against a possible national abortion ban after the U.S. Supreme Court overturned 50 years of abortion protections under Roe v. Wade. Bonta said they thought through arguments, even going so far as to decide in which court they would file suit. Bonta said his team h…