U.S. Secretary of State Marco Rubio on Thursday called for America's partners in the NATO alliance to up their defense spending to 5% of their GDP.

U.S. Secretary of State Marco Rubio and the Trump administration’s new envoy to NATO are seeking to reassure wary NATO allies of the U.S. commitment to the alliance.

Secretary of State Marco Rubio is in Brussels Thursday trying to reassure allies of the United States' commitment to NATO.

Marco Rubio is visiting NATO's headquarters for a meeting of foreign ministers, putting him on the front lines of the Trump administration's push against U.S. allies.

Secretary of State Marco Rubio told NATO allies they must make hard choices and increase defense spending to 5% to bolster capabilities in face of emboldened adversaries.

The United States is as committed to NATO as ever but demands that European allies spend substantially more on defence, U.S. Secretary of State Marco Rubio said on Thursday, while adding that the U.S.

The secretary of state said the U.S. will also need to increase its military spending and that Trump remains committed to the alliance.

Secretary of State Marco Rubio said he hopes to leave a NATO meeting with a commitment to 5 percent on defense spending.