President-elect Donald Trump on Sunday said once he is president he will take action to "keep men out of women's sports."

Trump made the comments at a campaign-style rally in Washington.

Transgender rights have become a political hot button in recent years. Republicans at all levels campaigned on the issue in November's election, with particular focus on transgender women participating in school sports. Trump pledged during his campaign to restrict gender-affirming care and transgender sports participation.

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