After a warm welcome in the Middle East and a "fantastic" visit with the pope, U.S. President Donald Trump walks on shakier ground on Thursday when European Union and NATO leaders will press him on defense, trade, and environmental concerns.
The Republican president, midway through his first foreign trip since taking office, has basked in the glow of favorable receptions in Riyadh and Jerusalem, where leaders lauded his harsh words for Iran.
Praise may be in shorter supply in Brussels.