agenda. when news of our trip broke yesterday, my office received a blunt message from the chinese embassy telling me to call off the trip." this trip comes at a diplomatically sensitive time for the white house. biden just invited taiwan to attend a summit of democracies next month, which china called a mistake. china also condemned another recent trip by u.s. lawmakers to taiwan and argued that it violates the one-china principle. now, biden, for his part, has reiterated his support for the one china principle and thaels where the u.s. officially recognizes beijing over taipei, but he has also said he opposes any unilateral efforts to disrupt or undermine peace and stability in taiwan. so you see the sort of tricky balancing act that biden is trying to enact here. >> zmelanie zanona, thanks so much. david sanger, this is the third u.s. delegation visit to taiwan since the summer.