The footballer was wearing a white suit jacket with B.G. initial on the lapel mentioning professional basketball player Brittney Griner, who is detained in Russia from February.
Griner's agent Lindsay Kagawa Colas said the letter was delivered to the White House on Monday but an official response from the President is still awaited.
Former US President's son Donald Trump Jr. too made his interest on the issue clear and gave a rationale as to why the suspension should be withdrawn.
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