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Federal appeals court judge Merrick Garland, center, stands with President Barack Obama and Vice President Joe Biden after being introduced as Obama’s nominee for the Supreme Court during an announcement in the Rose Garden of the White House, in Washington, Wednesday, March 16, 2016. Garland, 63, is the chief judge for the United States Court of Appeals for the District of Columbia Circuit, a court whose influence over federal policy and national security matters has made it a proving ground for potential Supreme Court justices. (AP Photo/Pablo Martinez Monsivais)

Federal appeals court judge Merrick Garland, center, stands with President Barack Obama and Vice President Joe Biden after being introduced as Obama's nominee for the Supreme Court during an announcement in the Rose Garden of the White House, in Washington, Wednesday, March 16, 2016. Garland, 63, is the chief judge for the United States Court of Appeals for the District of Columbia Circuit, a court whose influence over federal policy and national security matters has made it a proving ground for potential Supreme Court justices. (AP Photo/Pablo Martinez Monsivais)