Conservative columnist Ann Coulter issued a put-up-or-shut-up demand Tuesday to President Donald Trump, challenging him to identify exactly where his administration has erected new border barriers between the U.S. and Mexico.

Trump claimed Saturday on Twitter that the '[m]ajor sections of Wall are being built.' He tweeted a day earlier that his long-promised border wall 'is being built and is well under construction.'

Coulter told DailyMail.com in an email that she wants details.

'The President’s tweet says he’s already building the Wall. Could he give me the precise latitude and longitude of its location?' she asked. 'Also, how many miles long is it?'

'I want to throw a party there and need the exact coordinates,' she wrote.

The president first began to claim limited success with his ambitious project in the fall of 2017, tweeting that construction consisted of 'new renovation of old and existing fences and walls.'

Fifteen months later he claimed that his administration had 'already built large new sections & fully renovated others.'

Conservative pundit Ann Coulter once praised Trump's immigration policies but blasted him Monday night as a 'shallow, narcissistic, lying conman,' and now dares him to prove that he's built any new sections of border wall since becoming president

The documented border wall construction the Trump administration has engaged in so far has consisted of replacing some existing barriers and reinforcing others with secondary fencing

The president has boasted construction projects like the one in this photograph that bears an October 2018 date stamp, but the White House has never said where 'new' border barriers have been installed

Trump claimed last Friday that '[t]he Wall is being built and is well under construction'; Coulter trolled him on Tuesday, asking for information about exactly where that's happening

Trump tweeted a photo in January that he said showed a section of 'NEW WALL,' but didn't say where it was. The image included a date-stamp indicating that it was taken in October.

Since then all of his public statements have boasted of new wall construction – not renovation of older structures. 'The Wall is being built and will be a great achievement,' he tweeted February 12.

A week later his Twitter feed published a time-lapse video appearing to show a section of steel-slatted bollard wallbeing erected 'in New Mexico.' The tweet said it was '[c]ompleted on January 30, 2019 – 47 days ahead of schedule! Many miles more now under construction!'

The footage bore the logo of the Army Corps of Engineers, a federal agency that serves as general contractor for large federal public-works projects.

An Army Corps spokesman told a military blog the following day that the video was shot on Sep. 18, 2018. It consisted of 'a replacement project,' pre-approved repair work, and not a new wall.

The president tweeted this on February 20, including video (below) of what he claimed was three-week-old construction of a new section of wall in New Mexico; it turned out to be September 2018 repair work to replace walls that had been up for years

Coulter tried to put new pressure on Trump in a speech to the Forum Club of the Palm Beaches, just a few miles from the president's Mar-a-Lago resort club

The New York Times reported in January that 'no new miles of barriers had been built' during the Trump administration, although [s]ome existing barriers have been replaced.'

DailyMail.com asked the White House on Tuesday to identify the location of any 'place where there's a barrier now and there was none on Inauguration Day.'

One White House spokesperson referred the question to another, who did not respond. A Homeland Security Department spokesperson said information might be available 'tomorrow at the earliest.'

Coulter has stoked a new fire under Trump in the past week, claiming that the president has no intention of following through on his signature campaign promise to wall off Mexico from the United States.

She told a crowd of 600 Floridians on Monday that he is 'a shallow, narcissistic, lying conman.'

Trump had blasted her on Twitter two days earlier as a 'Wacky Nut Job,' ending any hope that Coulter might come back into the MAGA fold.

Trump's base continues to go wild for his wall but Coulter warns that he ignores them at his own peril

The flame-throwing author was all-in with Trump during the 2016 campaign, writing a love-poem book to the man she thought would upend America's immigration system and physically block illegal immigrants from reaching the U.S.

Three years later the president is cobbling together a piecemeal approach that doesn't meet with Coulter's approval. And in an auditorium just a few miles from his Palm Beach Mar-a-Lago resort club, she let the insults fly.

'Trump has no intention of fulfilling his campaign promises. This is not an anomaly. He's not trying. It's not an accident,' she said Monday night.

Coulter rattled off a list of sarcastic 2020 Trump campaign slogans, earning the biggest laughs for: 'The Wall! Oh, Never Mind.'

Trump insisted on Saturday that he's still serious about physically separating the U.S. and Mexico, and claimed he's 'winning on the border' after redirecting billions of dollars to the project through a national emergency declaration.

Trump has pushed Congress to fund his wall but was less aggressive when Republicans controlled both chambers – leading some conservatives to fear that he wants to own the political issue as a re-election issue more than he wants to fulfill his promises

Coulter rattled off a list of sarcastic 2020 Trump campaign slogans Monday night, earning the biggest laughs for: 'The Wall! Oh, Never Mind'

'Wacky Nut Job @AnnCoulter, who still hasn't figured out that, despite all odds and an entire Democrat Party of Far Left Radicals against me (not to mention certain Republicans who are sadly unwilling to fight), I am winning on the Border,' he wrote in a pair of tweets.

'Major sections of Wall are being built and renovated, with MUCH MORE to follow shortly. Tens of thousands of illegals are being apprehended (captured) at the Border and NOT allowed into our Country. With another President, millions would be pouring in. I am stopping an invasion as the Wall gets built. #MAGA.'

A caustic Coulter brushed him off Monday night during her speech to the Forum Club of the Palm Beaches.

'I don’t know why he doesn’t just ignore me,' she said. 'He doesn’t mind ignoring the rest of his base.'

Trump posted a pair of tweets criticizing Coulter on Saturday that also touted border wall progress

According to U.S. Customs and Border Patrol,about 654 miles of physical barriers block portions of the 1.954-mile southern U.S. border.

That includes 280 miles of vehicle fencing, which can stop a car but not a person on foot. Pedestrian fencing, designed to prevent people from climbing onto American soil, covers another 374 miles.

Coulter still agrees with Trump about the level of unfairness in his press coverage, saying the president should focus on 'the total destruction of the lying media.'

'Trump may be a shallow, narcissistic, lying conman, but that doesn’t mean the media are not the enemy of the people. Both things can be true,' she said.

The president said last month during a Fox News Channel interview that Coulter is 'off the reservation, but anybody that knows her understands that.'

'I haven't spoken to her, I don't follow her, I don't talk to her,' he sniffed.

Coulter responded on Twitter: 'He seems to think "the reservation" is HIM, not his campaign promises.'