Nearly all members of the transatlantic alliance agreeing to spend 5% of their gross domestic product on defense — a priority of President Trump's for years.

U.S. President Donald Trump on Wednesday wrapped up participation in the annual NATO summit, a gathering notable this year for an atmosphere that was far chummier toward Trump than the tension-filled meetings of his first term.

In a press conference before heading back to Washington, Trump struck a conciliatory tone as he sought to harvest praise for the spending boost.