Pedestrians pass in front of a section of a US-Mexico border wall in Tijuana.
Coulter made the comment on SiriusXM's "Breitbart News Daily" in a discussion with Alex Marlow, Breitbart's editor in chief.
The president's renewed call for border wall funding, immigration reform and strict enforcement measures came as Democrats appeared to be looking for a different campaign centerpiece than their recent calls for abolishing the U.S. Immigration and Customs Enforcement (ICE) agency. "There's only one decision-maker in the White House, and that's him". Was it 'I will hire half of Goldman Sachs? Trump wrote on Twitter.
"If we don't get border security".
One White House official said Trump's immigration-related demands have been raised by the administration "at every point" during the government spending talks.
The majority Democratic San Diego City Council, in a 3 to 1 vote last week, directed city officials to draft an ordinance requiring contractors competing for city projects to disclose any past and present work, as well as planned bids, on parts of Trump's planned border wall.
Congressional Republicans, already facing a hard election landscape, confronted a prospect on Sunday they had worked feverishly to avoid: a threat by President Trump to shut down the government over funding for a border wall.
The US president said he and the Italian prime minister are united in their conviction that strong nations must have strong borders.
Trump has embraced a big-spending approach to government since taking office, allowing Democrats to secure funding for a number of their priorities in order for him to win a bigger budget for the military.
Congress has given the president some wall funding but far from the $25 billion he has requested.
Trump's reference to "Catch & Release" is the policy that results in the release of illegal aliens while asylum claims are adjudicated. That policy led to thousands of children being separated from their parents at the southern border.
Trump has outlined what he wants in negotiations: to get rid of chain immigration, end the lottery program and stop sanctuary cities.
Though the last government shutdown was short and ultimately didn't do much damage to either political party, a shutdown only a few weeks before the November midterm elections could cause plenty of damage for whichever party the country blames.
House Republicans are trying to appropriate $5 billion to begin construction of the wall, a figure Trump has endorsed.
Trump's public statements about a shutdown have rattled GOP lawmakers anxious a closure months before the midterm elections could hurt their party. "But we're going to get the wall, even if we have to think about closing up the country for a while". Trump threatened at the time to veto the spending agreement, but eventually signed the bill while expressing his displeasure with Congress.
His former campaign manager, Paul Manafort, goes on trial Tuesday and his former attorney Michael Cohen is reported to have said Trump knew about the infamous June 2016 Trump Tower meeting when it happened.
Amid searing images of undocumented families being separated at the border, Trump defended the controversial practice, warning that there were "consequences when people cross our Border illegally".