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.

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

Secretary of State Marco Rubio arrived at in Brussels Thursday for talks that allies hope will shed light on the U.S.’ future plans in Europe.

Secretary of State Marco Rubio arrived at NATO to reassure the alliance about Trump’s intentions but warn that it can’t rely so heavily on the United States anymore.

The Senate has confirmed Matt Whitaker as President Donald Trump’s U.S. ambassador to NATO. The vote late Tuesday sends a crucial emissary to the Western alliance at a time of growing concern about the American commitment abroad.

April 2 (UPI) -- Matthew Whitaker was confirmed by the Senate to his role as U.S. ambassador to NATO.

The U.S.’s call for Europeans to spend more on militaries prompts talk of changing the rules for what counts as military spending.

BRUSSELS: US President Donald Trump is demanding NATO allies massively ramp up defence spending to five percent of GDP -- a level that looks well out of reach for many. But with countries across the alliance scrambling to boost budgets,

The sweeping new U.S. tariffs announced by President Donald Trump do not violate NATO treaties, the military alliance's Secretary-General Mark Rutte said on Friday after meeting NATO foreign ministers in Brussels.