My focus now is to be the best justice I can be: Brett Kavanaugh

New US Supreme Court Justice Brett Kavanaugh insists he has "no bitterness" over his bruising nomination process as he vowed to be a "team player."

"The Supreme Court is a team of nine. And I will always be a team player on the team of nine... The Senate confirmation process was contentious and emotional. That process is over," he said at a White House ceremony Monday to mark his promotion following an official swearing-in over the weekend.

"My focus now is to be the best justice I can be. I take this office with gratitude and no bitterness."

(With inputs from agencies.)