Anti-abortion activists are gathering in Washington to join the annual March for Life protest that has the support of President Donald Trump.
Organisers expected thousands of people to join the event, held each year to mark the anniversary of the Supreme Court decision legalising abortion.
Vice-President Mike Pence told them: “Life is winning again in America”. It comes less than a week after a large protest against Mr Trump was held in the nation’s capital city.
An estimated 500,000 people protested for women’s rights last Saturday – including many supporters of abortion rights -at the Women’s March.
Former Presidents Ronald Reagan and George W Bush have also addressed the crowds, but over the phone.
As governor of Indiana, Mr Pence signed some of the most restrictive laws prohibiting the procedure.
Senior White House adviser Kellyanne Conway is also due to speak.
The rally comes only days before Mr Trump announces his nominee for Supreme Court justice.
The Republican president has submitted a written vow to abortion-opponents, promising to appoint a judge that is against the procedure.
He has also promised to sign a national ban on abortion at 20 weeks of pregnancy, activists say.
Mrs Conway became the first woman to manage a successful presidential campaign when she helped lead Donald Trump to victory in November.
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