U.S. Senator Elizabeth Warren is criticizing President-elect Donald Trump, asserting he is violating a mandatory ethics law regarding presidential transitions and conflicts of interest—provisions which she says she wrote—and that refusal could have impacts on national security preparedness. Trump signed updates to this law during his first term in office. “Donald Trump and his transition team are already breaking the law,” Senator Warren wrote. “I would know because I wrote the law. Incoming presidents are required to prevent conflicts of interest and sign an ethics agreement. This is what ill…