To condemn last month's abduction of Nigerian girls, US First Lady Michelle Obama is to deliver her husband's weekly presidential address.
Although first ladies are normally seen to refrain from outspoken foreign policy remarks, however Mrs Obama has been a vocal campaigner for the release of more than 200 girls.
Many of the Nigerian girls still remain captive after fifty-three of the girls escaped soon after being seized in Chibok on 14 April, reports BBC.
The responsibility of the attack has been claimed by the Islamist militant group Boko Haram.
On Friday, Amnesty International claimed Nigeria's military had advance warning of the raid on Nigeria's north-eastern state however failed to act.
Nigeria's authorities say they "doubt the veracity" of the human rights group's claim.
'Call to action'
Mrs Obama is due to make the address ahead of Mother's Day, which the United States marks on Sunday.
White House Deputy spokesman Eric Schultz said as the mother of two young daughters, Mrs Obama is taking up the opportunity to express outrage and heartbreak, the president and she share over the kidnapping.
"The first lady hopes that the courage of these young girls serves as an inspiration... and a call to action for people around the world to fight to ensure that every girl receives the education that is their birthright," he added.
Michelle Obama has often appeared alongside her husband during the weekly addresses, which is broadcast on radio with a video version available online, however it is the first time she will deliver the speech alone.
Earlier this week, she tweeted a picture of herself in the White House holding a sign with the message "#BringBackOurGirls."
President Obama has described the kidnapping as "heartbreaking" and "outrageous".
A small number of US and British experts have now started arriving in Nigeria to assist the government's rescue efforts.
Nigerian President Goodluck Jonathan said on Friday he believed the schoolgirls were still in his country and had not been moved to neighbouring Cameroon.
Boko Haram has admitted capturing the girls, saying they should not have been in school and should get married instead.
In a video, group leader Abubakar Shekau threatened to "sell" the students.
Boko Haram, whose name means "Western education is forbidden" in the Hausa language, began its insurgency in Borno state in 2009.
At least 1,200 people are estimated to have died in the violence this year alone.