Independent Sen. Angus King of Maine could play a key role in the fate of President Donald Trump's nominee for the Supreme Court.
The nomination of Neil Gorsuch sets up a fight with Democrats over a judge who could shape America's legal landscape for decades to come.
Democrats are angry that the Republican-controlled Senate delayed a vote on former President Barack Obama's choice for the seat left empty by the death of Justice Antonin Scalia.
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With 52 Senate Republicans, the GOP would need help from Democrats to reach the 60-vote threshold to end a filibuster.
Republican Sen. Susan Collins of Maine previously voted for Gorsuch's appointment to the federal bench.
King said he'll carefully evaluate Gorsuch's philosophy and temperament "and make an independent judgment."