Monday is the anniversary of the Roe versus Wade Decision that legalized abortion in the United States in 1973. In addition to providing abortions, Planned Parenthood is a major source of routine medical care for women.
Introducing him, Vice President Mike Pence called Trump "the most pro-life president in American history".
Trump listed some anti-abortion measures his administration had taken, including an announcement earlier in the day by the US Department of Health and Human Services, reports Reuters.
"Your energy is so infectious", he told the crowd, praising them for being "the vigor and enthusiasm of the pro-life movement".
"We sit at a technological moment where people are seeing what happens inside a mom's tummy as a baby grows and develops".
On June 20 past year, Trump, 71, was sworn in as the 45th President of the US.
I want immigrants to come in from everywhere - Donald Trump
When it came to talk of extending protections for Haitians, Durbin said Trump replied, "We don't need more Haitians"'. Nielsen testified that she didn't remember or didn't hear Trump say the "s****hole countries" comment.
Trump previously supported women's access to abortion, saying in an interview in 1999, when he was still a celebrity real-estate tycoon in New York City, that while he 'hated the concept of abortion, ' he was 'very pro-choice'.
Those who voted against the bill, NRLC president Carol Tobias said, "will need to try to explain why they voted against making it a crime to treat a born-alive human person as medical waste, as a source for organ harvesting, or as a creature who may be subjected to lethal violence with impunity".
The bill augments a 2002 law by providing for criminal consequences for health care providers that fail to care for an infant who is born alive.
For anti-abortion activists like Karen Herzog from San Antonio, Texas, who has been attending the yearly rally since 2008, Mr Trump's words are encouraging.
Bills to make the Hyde Amendment permanent and to ban certain late-term abortions passed in the House but are unlikely to pass the Senate.
"You love your families, you love your neighbours, you love our nation and you love every child - born and unborn - because you believe every life is sacred", Trump said. They'll do what they say, ' " said Kristan Hawkins, president of Students for Life.
And in 2016 he refused to answer a question on the topic from New York Times columnist, Maureen Dowd, who asked when he was a "swinging bachelor in Manhattan, was he ever involved with anyone who had an abortion?". "I just feel that it's a culture of misogyny that results in abortions, and if we respected women more then women wouldn't see abortion as the most viable option".
On the anniversary of Roe and Doe, we remember the millions of children who have been denied their first and most fundamental right, the right to life.