President Donald Trump's defense secretary used part of his visit to Brussels to warn NATO allies that they must honor military spending pledges. "America cannot care more for your children's future security than you do," Trump criticized NATO during parts of his presidential campaign, saying allies have "been very unfair to us" for not spending more. The U.S. currently contributes 70 percent of alliance funds. "America will meet its responsibilities, but if your nations do not want to see America moderate its commitment to this alliance, each of your capitals needs to show support for our common defense."