ROUGH CUT (NO REPORTER NARRATION) Thousands of anti-abortion activists took to the streets of Washington, D.C.
On Friday, where they advocated for the 'right to life'.
The event is the largest annual gathering in the United States of opponents of the Supreme Court's 1973 ruling in Roe v.
That ruling found that certain state laws outlawing abortion were an unconstitutional violation of a woman's right to privacy, effectively legalizing abortion nationwide.
U.S. President Donald Trump spoke in a pre-recorded video.
"As president, I will always defend the first right in our Declaration of Independence, the right to life," he said.
Vice President Mike Pence appeared onstage at the rally to introduce the video, calling Trump, who before entering politics said he supported abortion access, "the most pro-life president in American history." During his 2016 campaign, Trump vowed to appoint Supreme Court justices he believed would overturn Roe.
He has since appointed two justices to the court, Neil Gorsuch and Brett Kavanaugh, cementing the court's 6-3 conservative-leaning majority.
Since the heated Senate confirmation hearings for Kavanaugh, the court has steered clear of some cases on volatile social issues involving abortion.
Supporters of abortion access say bans infringe on women's rights and health, and lead to greater rates of injury and death among pregnant women.
About half of U.S. adults say abortion should be legal, according to a Reuters/Ipsos poll last year, with about 68 percent of Democrats supporting abortion access compared to about 31 percent of Republicans.