The policy led to intense criticism in the United States and overseas, and Trump signed an executive order that would let children stay with their parents as they moved through the legal system, drawing renewed criticism.
"So I got arrested", she began, added that there were approximately 500 women who were arrested with her on Capitol Hill.
With her infant daughter in tow, Democratic Sen.
Police say those who were arrested were processed on the scene and released.
An afternoon of protests ended in many arrests in the Hart Senate Office Building on Thursday as a group of mostly female protesters flooded the atrium of the work space to protest President Donald Trump's immigration policies.
The administration's controversial "zero tolerance" policy of separating immigrant parents and their children on the USA border resulted in the separation of almost 2,000 children from their parents and guardians, sparking a public outcry.
The mass protest was one of several demonstrations that erupted across the country, providing a taste of what is expected to be much larger demonstrations on Saturday called by the Women's March and the Center for Popular Democracy.
Hundreds of activists protest the Trump administration's approach to illegal border crossings and separation of children from immigrant parents, in the Hart Senate Office Building on Capitol Hill in Washington, Thursday, June 28, 2018.
They were arrested by U.S. Capitol Police on charges of "crowdinig, obstructing, or incommoding".
Many protesters in the atrium of the Hart Senate building wore foil blankets similar to those given to migrants housed at USA detention facilities.
"This is far beyond politics", Jayapal said.
Other Democratic senators - including Ed Markey of Massachusetts, Mazie Hirono of Hawaii, Kirsten Gillibrand of NY and Richard Blumenthal of CT - also visited the protesters to support their efforts.
Democratic Sens. Jeff Merkley of Oregon, Kirsten Gillibrand of NY and Edward Markey of MA also appeared before the crowd.
The sit-in came two days after another show of liberal political energy in which 28-year-old political neophyte Alexandria Ocasio-Cortez ousted 10-term Rep. Joe Crowley in a Democratic primary for his House seat in NY. And eight people were arrested outside an ICE building in Portland, Oregon, that has been closed because of a round-the-clock demonstration.