retired Army Lt. Gen. Keith Kellogg; John Bolton, a former U.S. ambassador to the United Nations; Army Lt. Gen. H.R. McMaster; and the superintendent of the U.S. Military Academy at West Point, Lt. Gen. Robert Caslen.

White House spokesman Sean Spicer said there could be more meetings for the job, which is unexpectedly open after retired Gen. Michael Flynn’s firing early this week.

Also on Trump’s schedule Sunday: phone conversations with several foreign leaders Sunday and a health care policy meeting.

But for a moment on Saturday, Trump went back into campaign mode with a massive rally before thousands of supporters at an airplane hangar in Melbourne, Florida where he revived campaign promises to build a border wall along the U.S.-Mexico border, reduce regulations and create jobs — and continued hisat his private south Florida club, Mar-a-Lago.

Trump has lurched from crisis to crisis since the inauguration, including the botched rollout of his immigration order, struggles confirming his Cabinet picks and a near-constant stream of reports about strife within his administration.

Flynn’s departure was another blow. Flynn resigned at Trump’s request Monday after revelations that he misled Vice President Mike Pence about discussing sanctions with Russia’s ambassador to the U.S. during the transition. Trump said in a news conference Thursday that he was disappointed by how Flynn had treated Pence, but did not believe Flynn had done anything wrong by having the conversations.

Trump’s first choice to replace Flynn, retired Vice Adm. Robert Harward, turned down the offer.

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Associated Press writer Tamara Lush contributed to this report from Melbourne, Fla.

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