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By Peter Nicholas and Carol E. Lee, Wall Street Journal–

President-elect Donald Trump rounded out his senior White House team on Thursday, elevating a set of trusted advisers who helped engineer his surprise election victory and bringing some of the rhythms and spirit of his unconventional campaign into the government he will soon lead.

Mr. Trump tapped Kellyanne Conway as counselor to the president, giving his former campaign manager a sweeping mandate to help make good on his election promises. Ms. Conway, who has become something of a celebrity in her own right, will be part of what is shaping up to be a triumvirate of senior aides who are all confidantes of Mr. Trump.

Shortly after his victory Mr. Trump named Republican National Committee chairman Reince Priebus as his incoming chief of staff and media executive Steve Bannon as chief strategist. Though Mr. Priebus is atop the formal organizational chart, in practice Ms. Conway and Mr. Bannon may prove to be every bit as influential.

It is an arrangement that some White House veterans warned could create the potential for rival power centers within the White House. To discourage that, Andrew Card, who served as chief of staff to President George W. Bush, said it is critical that their roles be clear.

“What are the defined responsibilities of the staff and how do you hold them accountable?” Mr. Card asked. “You don’t want to just have a great debating society in the White House; you want to have discipline around the debate because time is your enemy. The president has to make decisions in real time.”

It is an arrangement that some White House veterans warned could create the potential for rival power centers within the White House. To discourage that, Andrew Card, who served as chief of staff to President George W. Bush, said it is critical that their roles be clear.

“What are the defined responsibilities of the staff and how do you hold them accountable?” Mr. Card asked. “You don’t want to just have a great debating society in the White House; you want to have discipline around the debate because time is your enemy. The president has to make decisions in real time.”