Vice President Mike Pence will speak at the March for Life, an anti-abortion demonstration advocating for "a world where every human life is valued and protected."

Kellyanne Conway, Mr Trump’s former campaign manager and current senior adviser to the President, will also speak.

Earlier this week, Press Secretary Sean Spicer promised support for the march, saying, "I think it’s no secret that the President has campaigned as a pro-life President…Obviously we’re going to have heavy administration presence there."

The news of Mr Pence’s speech at the march follows Trump reinstating the Mexico City Policy, an executive order that bans American foreign aid to organisations that provide abortion counselling.

Based on the number of bus permits, the number of attendees at the march is expected to be significantly less than the women's marches in the capital last weekend.

The news also ties to growing anxieties over the future of women’s reproductive rights.

Roe v Wade lawyer Sarah Weddington has said that Mr Trump’s presidency presents the biggest threat yet to abortion rights.

She wrote in a Facebook post, “A lot of people have invested time and resources to ensure all women have access to all their reproductive choices.

“These people must keep working. And they must reach out to younger people who have the energy and passion to continue this fight.”

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Mr Pence has a long history of fighting women's reproductive rights when he was governor of Indiana.

In his home state, citizen Purvi Patel was sentenced to 20 years behind bars for infanticide after she allegedly induced her own abortion and went to hospital. The charges were overturned and she was released after 18 months.

The state has also pursued legislation to ensure women undergo a funereal process for aborted fetuses and miscarriages.

A few days after Mr Pence’s speech, Mr Trump is expected to announce the Supreme Court nominee he has chosen to replace the late Justice Antonin Scalia.

During his campaign, he said that he would, “appoint judges very much in the mold of Justice Scalia.”