U.S. President Donald Trump said on Thursday he was not sure the United States should be spending anything on NATO, telling reporters the U.S. was protecting NATO members, but they were "not protecting us.

Europe’s military heavyweights have already said that meeting President Donald Trump’s potential challenge to spend up to 5% of their economic output on security would be challenging

President Donald Trump has called for NATO members to significantly increase their spending on defense, suggesting a target of 5% of gross domestic product to go toward military spending. What To Know: Trump reiterated the 5% of GDP spending goal on Monday following his inauguration,

NATO Faces Pressure to Increase Defense Spending NATO is under renewed scrutiny following U.S. President Donald Trump’s sharp demands for increased defense contributions from European allies. Trump’s call for fairer burden-sharing has reignited debates on financial commitments,