Washington (AFP) - The White House declined to comment Sunday on speculation that a pivotal US Supreme Court justice might announce his retirement on Monday, the last day of the high court's current session.

Justice Anthony Kennedy, who has cast the decisive vote in some of the court's most far-reaching decisions, turns 81 next month and is widely believed to be thinking of retiring.

When asked about that, White House adviser Kellyanne Conway told ABC: "I will never reveal a conversation between a sitting justice and the president or the White House, but we're paying very close attention to these last bit of decisions."

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