"Miller pushed Tillerson and the State Department to be tougher on immigration and make changes to the programs they control," four unnamed sources told Politico, and the two men were observed in a strained conversation in which Tillerson was "quite clear" he expects autonomy as head of State. Per Politico's sources, Tillerson is chafing at the expectation that he would take direction from substantially younger and less experienced administration figures like Miller.
Miller is reportedly working on legislation and regulatory changes to cut back on legal immigration, including refugee admissions. The State Department currently houses the Bureau of Consular Affairs and the Bureau of Population, Refugees, and Migration, the agencies responsible for refugee vetting as well as visa and passport issuance. A White House memo reported by CNN Friday indicated the Trump administration may move those offices under the aegis of the Department of Homeland Security, a change that would fit President Trump's broader preference for State Department cuts.