Host Steve Doocy compared the situation to children being taken away from parents who committed a bank robbery.
Nielsen is the latest administration official to be called out for misleading statements on the policy. The Father's Day march was organized by Rep. Beto O'Rourke, D-Texas, who is challenging Republican Sen.
Children whose parents are referred for prosecution will be placed with the Department of Health and Human Services (HHS), Office of Refugee Resettlement (ORR).
Attorney General Jeff Sessions cited the Bible on Thursday, June 14, in his defense of his border policy that is resulting in hundreds of immigrant children being separated from their parents after they enter the US illegally.
Democrats went on the counterattack, with top House Democrat Nancy Pelosi calling the Republican proposal "simply unworthy of America".
"The government should be in the business of keeping families together, not tearing them apart", Harris, a rising star in the Democratic Party, said in a statement.More news: Afghan High Peace Council Calls On Taliban to Extend Ceasefire
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On Sunday night, Nielsen accused others of distorting reality, saying via Twitter, "This misreporting by Members, press & advocacy groups must stop".
The Attorney General directed United States Attorneys on the Southwest Border to prosecute all amenable adults who illegally enter the country, including those accompanied by their children, for 8 U.S.C. § 1325 (a), illegal entry.
The William Wilberforce Trafficking Victims Protection Reauthorization Act was signed by President George W. Bush in 2008, and ensured that children who arrive at the US-Mexico border unaccompanied are "exempt from prompt return to their home country", unless those countries are Canada or Mexico.
As reporters questioned whether children were being adequately cared for and whether the policy constituted child abuse, Nielsen said that the DHS was merely enforcing policies and it was up to Congress to change the laws.
Earlier Monday he tweeted: "It is the Democrats fault for being weak and ineffective with Boarder Security and Crime. Don't wait until after the election because you are going to lose!"
In a series of tweets on Monday, Nielsen said, "Border security and immigration enforcement are complex topics" that can't "be reduced to media soundbites".
Furthermore, the rise of facilities that house children separated from their families at the border during Trump's administration has been well documented.