CLEVELAND, OH - AUGUST 06: Republican presidential candidates Wisconsin Gov. Scott Walker (L) and Donald Trump participate in the first prime-time presidential debate hosted by FOX News and Facebook at the Quicken Loans Arena August 6, 2015 in Cleveland, Ohio. The top-ten GOP candidates were selected to participate in the debate based on their rank in an average of the five most recent national political polls. (Photo by Scott Olson/Getty Images)
President Donald Trump agreed to meet alliance leaders in Europe in May in a phone call on Sunday with NATO Secretary General Jens Stoltenberg that also touched on the separatist conflict in eastern Ukraine, the White House said.
Trump was elected on a pledge to push NATO members to increase their funding to the western alliance to ease the financial burden on the United States.