Sen. Tammy Duckworth Ladda (Tammy) Tammy DuckworthMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled Biden courts veterans amid fallout from Trump military controversies John Fogerty: 'Confounding' that Trump campaign played 'Fortunate Son' at rally MORE (D-Ill.) and her newborn baby on Thursday joined hundreds of mostly women at a protest of the Trump administration's "zero tolerance" immigration policy on Capitol Hill.

The Illinois Democrat, who recently gave birth to baby girl named Maile, joined Democratic colleagues Sens. Jeff Merkley Jeffrey (Jeff) Alan MerkleyThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Sunday shows - Trump team defends coronavirus response Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (D-Ore.) and Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (N.Y.), and others who also attended a protest on Capitol Hill.

Sen. Duckworth and her baby heading to the TV cameras after revving up the protesters pic.twitter.com/jcagr02sOt — Andrew Desiderio (@desiderioDC) June 28, 2018

"I wanted to show my support for the folks here today," Duckworth told CNN after her visit with protesters. "I could only imagine what it would be like to have my daughter -- my breastfeeding child -- ripped away from me the way some of these other moms' babies have been."

Demonstrators at the protest wrapped themselves in foil to represent the foil-like sleeping bags migrant children slept in at detention facilities after being separated from their parents.

Hundreds of people were reportedly arrested at the event, including Democratic Rep. Pramila Jayapal (Wash.).

ADVERTISEMENT

The controversial family separations are a result of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's policy to prosecute all immigrants who cross the U.S.-Mexico border illegally. It led to hundreds of children being separated and detained separately from their families.

After public backlash over the policy, Trump signed an executive order allowing families to be detained together. However, it remains unclear how the administration will reunite families.

Duckworth and Maile also made headlines earlier this year by making what is thought to be the first appearance of a baby on the Senate floor.