"I can stand up and say they are right because it's the right thing to do for this country," Mark Morgan said.
Of all the networks, CBS pulled in the largest audience, with more than 8 million viewers tuning in for the address and rebuttal.
Undocumented migrants pay more than $20 billion in taxes annually, according to the IRS.
Federal employee union leaders and Democratic leaders slammed the president's speech and accused him of holding the government hostage.
As Twitter lit up with responses to President Donald Trump's televised address, conservatives including Donald Trump Jr. and Megyn Kelly criticized a joke by the "Late Night With Seth Meyers" account.
"Sarah, there were some discrepancies with some numbers," 'Fox & Friends' co-host Ainsley Earhardt said.
"I think certainly I have expressed more than a few times the frustrations with a government shutdown and how useless it is," Senator Shelley Moore Capito of West Virginia told CNN.
Democratic strategist gives damning criticism of president's first prime-time Oval Office address.
The freshman congresswoman doubled down on the accusation she made during an interview with Anderson Cooper on Sunday.
"The emergency declaration," Andrew Napolitano said, "allows him to mobilize assets, but it doesn't allow him to take or occupy property, and it doesn't allow him to spend money the Congress hasn't authorized."
The vice president said Trump got the "impression" past administrations wanted a wall, but Trump claimed some former presidents had told him directly.
Barack Obama, Jimmy Carter, George W. Bush and Bill Clinton have all distanced themselves from Trump's border wall claims.
"How do you say trademark misuse in Dothraki?" HBO previously tweeted.
The comedian said the U.S. government shutdown is a "self-inflicted crisis" caused by an "incompetent and unhinged" president.
Senator Joe Manchin of West Virginia said Trump should bring back a vote on the 2013 immigration bill so he can "get what he needs" in funding for his border wall.
"Trump going to the border is like politicians who switch positions on gay marriage after talking to a gay person," Coulter said.
Thomas Homan also argued that Democrats are only against the border wall because they want to see Trump fail.
"I am pleased to inform you that I will Address the Nation on the Humanitarian and National Security crisis on our Southern Border," Trump tweeted.
If a deal isn't struck by the end of this week and the shutdown stretches into Saturday, it will become the longest government shutdown on record.
South Carolina Republican Sen. Lindsey Graham sought to widen Washington's divide during a Sunday rant against the "radical left" who refuse to bill American taxpayers about $5.7 billion for President Donald Trump's border wall.
"I don't think anybody blames the president for the coarsening of the language," Mick Mulvaney said.
"Do you know where those 4,000 [suspected terrorists] come, where they're captured?" Chris Wallace asked. "Airports," he answered.
"[Republicans] are seizing gov operations [and] innocent people's pay until they get what they want," the progressive congresswoman wrote on Twitter.