WATCH LIVE: President Trump Speaks at Anti-Abortion March For Life Event

U.S. President Donald Trump departs following a Congressional Gold Medal ceremony for former Senator Bob Dole at the U.S. Capitol in Washington, U.S., January 17, 2018. REUTERS/Aaron P. Bernstein

President Donald Trump will address the anti-abortion March for Life on Friday — becoming the first sitting president to address the gathering. (Ronald Reagan and George W. Bush spoke to the group, but they did so by phone.)