"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.
Congressional leadership staff from both parties arrived at the White House Saturday morning to meet with Vice President Mike Pence and other administration officials to continue negotiating.
"We can call a national emergency because of the security of our country, absolutely. We can do it. I haven't done it, I may do it. I may do it, but we can call a national emergency and build it quickly, it's another way of doing it," said Trump.
"Steel is stronger than concrete," Trump told the reporter repeatedly.
"Donald Trump has made a promise to the American people," Senator Lindsey Graham said. "He's going to secure our border."
The right-wing commentator, who was once such a staunch Trump supporter that she wrote a book titled "In Trump We Trust," has been increasingly critical of the president over his failure to build his long-touted barrier between the United States and Mexico.
"What we're unwilling to do is to pay a $5 billion ransom note for a medieval border wall that Trump wants to put forward that he initially said…that Mexico would pay for," New York Democrat Hakeem Jeffries told CNN.
Trump invited congressional leaders from both parties to the White House on Wednesday for a border security briefing, their first face-to-face meeting since the shutdown began 11 days ago.
"This is the president of the United States' signature domestic policy," Leland Vittert said.
On the ninth day of the partial government shutdown, Trump used the Obamas' brick fence to justify building the border wall.