WASHINGTON — The Supreme Court on Monday seemed likely to expand presidential control over independent federal agencies, signaling support for President Donald Trump’s firing of board members.

The court’s conservative majority suggested it would overturn a unanimous 90-year-old decision that has limited when presidents can fire agencies’ board members — in part to try to ensure decision making free of political influence — or leave it with only its shell intact.

Justice Brett Kavanaugh said the crux of the issue is that the officials who direct the agencies “are exercising massive power over individual liberty and billion-dollar industries” without being accountable to anyone.

Liberal justices warned that a ruling sought by the administration to overturn the decision known as Humphrey’s

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