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Pope Francis will join a huge anti-abortion rally in Washington on Wednesday — in his prayers, at least.

The pontiff tweeted his support for the March for Life, expected to draw thousands despite snowy, cold conditions.

The march marks the 40th anniversary of the 1973 Supreme Court decision in the famed Roe v. Wade case that affirmed a woman's right to an abortion.

Earlier this month, Francis called abortion "horrific," using some of the strongest language on the issue since his election last March.

Francis had worried some conservatives in the Catholic Church with comments suggesting the Church should shake off an "obsession" with such divisive issues as abortion, contraception and homosexuality.

Pope Francis looks on during his general audience at St Peter's square on Wednesday at the Vatican.ANDREAS SOLARO / AFP - Getty Images