President Trump's former campaign manager, Corey Lewandowski Corey R. LewandowskiHow Trump can win reelection: Focus on Democrats, not himself Trump Jr. distances from Bannon group, says he attended 'single' event Bannon, three others charged with defrauding donors of 'We Build The Wall' campaign MORE, said Sunday that administration officials need to be in line with the president's agenda.

“You can have a disagreement with the president. He wants to have conversations on all sides but when the decision is made, you have to be on the team because the president is the final arbiter,” Lewandowski said on NBC’s “Meet The Press."

His comments follow high-level shake-ups in the Trump administration. Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE, top economic adviser Gary Cohn Gary David CohnGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Former national economic council director: I agree with 50 percent of House Democrats' HEROES Act MORE and national security adviser H.R. McMaster have all left the White House in recent weeks.

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Tillerson and McMaster both frequently clashed with the president and publicly voiced differing opinions, while Cohn resigned amid a disagreement over Trump’s decision to implement steel and aluminum tariffs.

Lewandowski on Sunday said Trump is willing to listen to conflicting opinions, but those who disagree with his policy positions “might not want to be in the building.”

“When [Trump] brings in new individuals, he takes information from all of the people around him, and then listens to those positions and then he makes the final decision,” Lewandowski said.

“What you have to have inside the building are people who are on the president’s agenda. Whether that means this president is implementing steel and aluminum tariffs, if you’re not on that agenda, you might not want to be in the building,” he said.

“He is bringing people in who are on his team to make sure that his agenda is moving forward,” he added.

Trump last week named former U.S. Ambassador to the United Nations John Bolton to replace McMaster. The pick drew criticism from Democrats, who expressed concerns over Bolton’s past pro-war views.

The president has also named Larry Kudlow as Cohn’s replacement atop the National Economic Council, and named CIA Director Mike Pompeo Michael (Mike) Richard PompeoOvernight Defense: House Democrats unveil stopgap spending measure to GOP opposition | Bill includes .6B for new subs | Trump issues Iran sanctions after world shrugs at US action at UN Navalny calls on Russia to return clothes he was wearing when he fell ill US issues Iran sanctions to enforce UN action ignored by international community MORE as his choice for secretary of State.