Obama pushes Senate over Scalia seat
Obama has urged the US Senate to act after he nominates a replacement on the Supreme Court for Justice Antonin Scalia.
"I expect them to do their job", he said, and consider the candidate as required by the US Constitution.
Scalia, a long-time conservative on the court, died on Saturday.
Within hours leaders of the Republican-controlled Senate had said they would delay confirming any nomination until a new president is in power next year.
Republicans argue it should be up to the electorate to pick a president who can nominate the right candidate for the job.
Scalia's death leaves the court finely balanced with four judges appointed by Democratic presidents and four by Republican ones, so the new appointment would leave the court liberal or conservative leaning.