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Merrick Garland, chief judge of the U.S. Court of Appeals for the District of Columbia Circuit, center, shakes hands with U.S. President Barack Obama, right, following the announcement of his nomination for the Supreme Court as Vice President Joseph 'Joe' Biden looks on in the Rose Garden at the White House in Washington, D.C., U.S., on Wednesday, March 16, 2016. The nomination escalates a battle that will dominate the final 10 months of Obamas presidency, as the White House is locked in an unprecedented dispute with Senate Republican leaders who have pledged to ignore the presidents choice. Photographer: Joshua Roberts/Bloomberg via Getty Images

Merrick Garland, chief judge of the U.S. Court of Appeals for the District of Columbia Circuit, center, shakes hands with U.S. President Barack Obama, right, following the announcement of his nomination for the Supreme Court as Vice President Joseph 'Joe' Biden looks on in the Rose Garden at the White House in Washington, D.C., U.S., on Wednesday, March 16, 2016. The nomination escalates a battle that will dominate the final 10 months of Obamas presidency, as the White House is locked in an unprecedented dispute with Senate Republican leaders who have pledged to ignore the presidents choice. Photographer: Joshua Roberts/Bloomberg via Getty Images