While U.S. President Donald Trump hammered home his domestic agenda Tuesday in his first address to a joint session of Congress, he also used the speech to remind security allies — including Japan — that they must "pay their fair share" of the alliances' costs.

Trump, who pledged a "renewal of the American spirit," also used the address as yet another opportunity to reassure nervous allies fearful of a U.S. retreat from the global stage.

"To those allies who wonder what kind of friend America will be, look no further than the heroes who wear our uniform," Trump said. "Our foreign policy calls for a direct, robust and meaningful engagement with the world. It is American leadership based on vital security interest that we share with our allies all across the globe."