Hours earlier, he had announced that U.S. forces had assaulted the hiding place of Islamic State leader Abu Bakr al-Baghdadi, who was killed in the raid in northeast Syria.
A military success against a most-wanted enemy of the U.S. and its allies could have provided the president a rare moment of bipartisan comity, especially amid a divisive impeachment inquiry.
At the end of the third inning, ballpark video screens carried a salute to U.S. service members that drew cheers throughout the stadium.
Until Sunday night, Trump had yet to attend a major league game as president even though the White House is a few miles northwest of Nationals Park.
Trump's staff has long tried to shield him from events where he might be loudly booed or heckled, and he has rarely ventured into the neighborhoods of the heavily Democratic city.
Major League Baseball Commissioner Rob Manfred said he discussed with Trump whether he'd like to throw out the ceremonial first pitch, but the president declined while citing the disruption that would cause fans getting to the ballpark.
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