(CNN) Senate Foreign Relations Chairman Bob Corker bluntly warned Wednesday that US influence around the world is "diminishing" and said that President Donald Trump's comments about NATO have been "damaging" to American leadership in an apparent effort to "tear apart" a critical alliance.

Corker has grown increasingly unnerved about Trump's sharp attacks against NATO, raising alarms that the President's rhetoric and actions have "destabilized" a key part of the post-World War II order.

"It's palpable," Corker said when asked if Trump has damaged US standing around the world. "The concern people have is to our reliability."

Corker added that "I do worry" Trump is trying to "tear apart" NATO.

"I believe that America's leadership around the world has made the world safer for Americans and has made the world a better place," said Corker, a second-term Tennessee Republican. "And when I see that leadership diminishing, and us trying to break apart alliances that we created, it troubles me."

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