WASHINGTON >> President Donald Trump’s removal of national security adviser Mike Waltz brings further disruption to a national security team that has already endured scrutiny over using the Signal messaging app to discuss sensitive military operations as well as mounting questions over the leadership of Defense Secretary Pete Hegseth and the firing of the four-star general who led the National Security Agency.

The staff shake-up comes as the administration confronts foreign policy issues that include Iran’s rapidly advancing nuclear ambitions, a trade fight with China and conflicts in Gaza and Ukraine that have defied easy resolutions despite Trump’s initial confidence that he could settle both wars quickly.

But Waltz’s departure also presents an opportunity for Trump to consolidate foreign policy in just a few hands, with the Republican president asserting even more power over decision-making and relying on a select group of people who have entirely embraced his “America First” agenda.

Those influential voices include special envoy Steve Witkoff and Secretary of State Marco Rubio, who on Thursday was named to replace Waltz on an acting basis while Waltz was nominated as the U.S. ambassador to the United Nations.