Kate MacGregor, who served as Interior deputy secretary during the Trump administration, is leading the Trump transition effort at that department, according to a person who works for the Biden administration. MacGregor, who could return as Interior’s deputy in a second Trump term, held several other senior posts at the department under Trump, including as deputy chief of staff for policy and principal deputy assistant secretary for land and minerals management. The Trump transition landing team had not yet arrived at the Interior Department headquarters as of Wednesday afternoon, said the Biden administration source, who was granted anonymity to discuss transition details that had not been publicly announced.