President Donald Trump has pushed European NATO members to increase their financial contribution to the alliance.

The summit comes as Trump's team pushes for NATO members to make even bigger changes that would allow the U.S. to turn its attention from Europe to other parts of the globe.

Under pressure from Washington, the impetus is on European NATO members at this week's summit in Ankara to show they can deliver on defense spending commitments.

NATO leaders will spend the two-day summit trying to appease President Donald Trump's desire for greater defense spending commitments.