Most of the leaders Biden will see in Europe are likely to be grateful for a return to a more predictable American foreign policy agenda after Trump’s transactional populism. The United States will announce it is buying 500 million doses of Pfizer’s vaccine to donate to other countries, The Washington Post reported Wednesday. At one NATO meeting in 2018, Trump threatened to pull out of the alliance if members did not cough up more money for defense on the spot. NATO leaders are now hoping for a sharp change in tone. ambassador to the United States, said at a recent event organized by the German Marshall Fund that the summit will have two audiences.