Anti-abortion activists march up Constitution Avenue en route to the Supreme Court in Washington, Friday, Jan. 27, 2017, during the 44th annual March For Life. (AP Photo/Carolyn Kaster)

Vice President Mike Pence listens as his wife Karen Pence speaks at the March for Life on the National Mall in Washington, Friday, Jan. 27, 2017. (AP Photo/Manuel Balce Ceneta)

Anti-abortion activists march up Constitution Avenue en route to the Supreme Court in Washington, Friday, Jan. 27, 2017, during the 44th annual March For Life. (AP Photo/Carolyn Kaster)

Anti-abortion activists march up Constitution Avenue en route to the Supreme Court in Washington, Friday, Jan. 27, 2017, during the 44th annual March For Life. (AP Photo/Carolyn Kaster)

Anti-abortion activists kneel and pray in front of the Supreme Court in Washington, Friday, Jan. 27, 2017, during the annual March for Life. Thousands of anti-abortion demonstrators gathered in Washington for an annual march to protest the Supreme Court's landmark 1973 decision that declared a constitutional right to abortion. (AP Photo/Andrew Harnik)

Anti-abortion activists converge in front of the Supreme Court in Washington, Friday, Jan. 27, 2017, during the annual March for Life. Thousands of anti-abortion demonstrators gathered in Washington for an annual march to protest the Supreme Court's landmark 1973 decision that declared a constitutional right to abortion. (AP Photo/Andrew Harnik)

Pro-life and anti-abortion activists converge in front of the Supreme Court in Washington, Friday, Jan. 27, 2017, during the annual March for Life. Thousands of anti-abortion demonstrators gathered in Washington for an annual march to protest the Supreme Court's landmark 1973 decision that declared a constitutional right to abortion. (AP Photo/Andrew Harnik)

Anti-abortion activists and supporters of President Donald Trump march up Constitution Avenue en route to the Supreme Court in Washington, Friday, Jan. 27, 2017, during the 44th annual March For Life. (AP Photo/Carolyn Kaster)

Anti-abortion demonstrators arrive on Capitol Hill in Washington, Friday, Jan. 27, 2017, during the March for Life. The march, held each year in the Washington marks the anniversary of the 1973 Supreme Court decision legalizing abortion. (AP Photo/J. Scott Applewhite)

Anti-abortion activists march up Constitution Avenue en route to the Supreme Court in Washington, Friday, Jan. 27, 2017, during the 44th annual March For Life. (AP Photo/Carolyn Kaster)

Anti-abortion activists are reflected in sunglasses as they converge in front of the Supreme Court in Washington, Friday, Jan. 27, 2017, during the annual March for Life. Thousands of anti-abortion demonstrators gathered in Washington for an annual march to protest the Supreme Court's landmark 1973 decision that declared a constitutional right to abortion. (AP Photo/Andrew Harnik)

Pro-life activists converge in front of the Supreme Court in Washington, Friday, Jan. 27, 2017, during the annual March for Life. Thousands of anti-abortion demonstrators gathered in Washington for an annual march to protest the Supreme Court's landmark 1973 decision that declared a constitutional right to abortion. (AP Photo/Andrew Harnik)

Anti-abortion demonstrators arrive on Capitol Hill in Washington, Friday, jan. 27, 2017, during the March for Life. The march, held each year in the Washington marks the anniversary of the 1973 Supreme Court decision legalizing abortion. (AP Photo/J. Scott Applewhite)

From left, Krista Brown, her son Christopher Brown and Regina Long, all from Rochester, N.Y. hold banners during the March for Life near the National Mall in Washington, Friday, Jan. 27, 2017. (AP Photo/Manuel Balce Ceneta)

Anti-abortion demonstrators arrive on Capitol Hill in Washington, Friday, Jan. 27, 2017, during the March for Life. The march, held each year in the Washington marks the anniversary of the 1973 Supreme Court decision legalizing abortion. (AP Photo/J. Scott Applewhite)

Anti-abortion demonstrators arrive on Capitol Hill in Washington, Friday, Jan. 27, 2017, during the March for Life. The march, each year in the Washington marks the anniversary of the 1973 Supreme Court decision legalizing abortion. (AP Photo/J. Scott Applewhite)

Anti-abortion demonstrators arrive on Capitol Hill in Washington, Friday, Jan. 27, 2017, during the March for Life. The march, held each year in the Washington, marks the anniversary of the 1973 Supreme Court decision legalizing abortion. (AP Photo/J. Scott Applewhite)

Marchers at the 4th annual St. Francis University March for Life brave the cold and snow as they walk around the campus mall, Friday, Jan. 27, 2017, in Loretto, Pa. (Todd Berkey/The Tribune-Democrat via AP)

Vice President Mike Pence, left, with his wife Karen Pence, center, wave to the crowd at the March for Life on the National Mall in Washington, Friday, Jan. 27, 2017. (AP Photo/Manuel Balce Ceneta)