She also praised the efforts Trump and his administration have made in increasing legal protections for the unborn.
"From the appointment of pro-life judges and federal workers, to cutting taxpayer funding for abortions here and abroad, to calling for an end to late-term abortions, President Trump and his Administration have been consistent champions for life and their support for the March for Life has been unwavering," Mancini said. "We are grateful for all these pro-life accomplishments and look forward to gaining more victories for life in the future."
Many of Trump's pro-life policies - such as the restoration and expansion of the Mexico City Policy, which bars U.S. aid to foreign organizations that perform or promote abortions as a means of family planning - have been praised by the U.S. Conference of Catholic Bishops, while his crackdowns on immigration have frequently drawn criticism from the bishops.
Other political speakers at the March for Life this year will include First Lady of Louisiana Donna Hutto Edwards, Rep. Steve Scalise (R-LA), state senator Katrina Jackson (D-LA), and Rep. Chris Smith (R-NJ).
While Trump will be the first U.S. president to address the March in person, President Ronald Reagan and President George W. Bush also delivered messages to the March for Life remotely via telephone in previous years.
In his 2004 message, Bush thanked the marchers for their "devotion to such a noble cause" and encouraged them to "continue with civility and respect to remind our fellow citizens that all life is sacred and worthy of protection," the New York Times reported.