But referring back to initial comments from Pence's staff, Warren wants to know if the State Department was aware of the suggestion for Pence to stay at the Trump property, and if it factored "into the decision-making process" for where Pence would stay.

Warren also asked for the total cost of Pence's trip to Doonbeg and how it would have compared to him staying in Dublin, which State Department officials approved Pence's travel plans or if they were reviewed by ethics officials, and all communications between the department and Pence's staff about his stay in Doonbeg.