China- US action and cooperation in the new age of global climate governance
Trade, security, and the U.S.-Mexico relationship
The future of school-based social and emotional learning programs
I think it's unusual for the chief of staff to go on a trip, particularly on a trip this long. The chief of staff is usually more of a chief operating officer in the White House itself, and normally when your principal—whether it's the president himself or the head of Cabinet agency—goes abroad, you have his deputy and those folks staying behind to help manage operations in his absence.