Donald J. Trump on Wednesday unveiled a list of prospective Supreme Court nominees, seeking to pacify veteran Republicans who fear he does not take judicial matters seriously and to reassure conservatives that his appointees would reflect a right-leaning philosophy. Here is a look at his possible picks:

Steven M. Colloton, Iowa

Born: 1963

Position: United States Court of Appeals for the Eighth Circuit

Background: Judge Colloton, who was nominated by President George W. Bush in 2003, once clerked for Chief Justice William H. Rehnquist and was an associate independent counsel on the Whitewater investigation in the mid-1990s.

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Allison H. Eid, Colorado