WASHINGTON — While President Donald Trump’s aggressive use of executive power has resulted in a flurry of lawsuits, administration officials have won a series of high-profile victories at the Supreme Court in part due to careful case selection aimed at securing the backing of the conservative majority. The White House has won 18 times at the Supreme Court since Trump took office and is on a 15-case winning run. The last loss was in May. “They’re ecstatic,” a person close to the

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