A day after unveiling a sweeping immigration policy that didn't address illegal immigration, President Donald Trump vented on Twitter and warned people sneaking into the U.S. to pack their bags for deportation.

'All people that are illegally coming into the United States now will be removed from our Country at a later date as we build up our removal forces and as the laws are changed,' he vowed. 'Please do not make yourselves too comfortable, you will be leaving soon!'

Trump promised in November 2015 amid a contentious Republican primary fight that he would round up and evict illegal immigrants as president.

'You're going to have a deportation force, and you're going to do it humanely,' he said then.

President Donald Trump said Friday on Twitter that he plans to round up immigrants who aren't qualified to stay after they are released into the U.S. pending court hearings

People who cross the border into the U.S. and are apprehended and released, Trump tweeted, are being 'registered' so immigration authorities can find them and eject them from the country at a later date

About 11.3 million people are living illegally in the U.S., according to the Migration Policy Institute. The organization says about two-thirds of them have jobs and roughly 900,000 are students enrolled in schools.

Many of those millions came via legitimate programs but overstayed their visas. The Roughly two-thirds of illegal immigrants in the U.S. have been here for more than 10 years, according to the Pew Research Center.

But a sea of humanity continues to cross into the country from Mexico.

That latter group was Trump's Twitter target on Friday.

'Border Patrol is apprehending record numbers of people at the Southern Border,' he tweeted Friday. 'The bad 'hombres,' of which there are many, are being detained & will be sent home.'

'Those which we release under the ridiculous Catch & [R]elease loophole, are being registered and will be removed later!'

Trump misspelled 'Release' as 'Telease,' fitting a pattern that has White House aides exasperated.

Trump wants to see as many illegal immigrants as possible send outside the U.S., and has taken steps to force asylum-seekers to wait in Mexico as America's legal process unfolds

The prospect of locating people who are released into the interior of the U.S pending asylum hearings can be a danuting one. U.S. Immigration and Customs Enforcement statistics show a large majority of them don't return to court.

From the government's point of view, they vanish entirely.

At minimum, there is no guarantee that 'registering' them upon their release will help authorities find them later.

ICE officials said this month that they have released more than 160,000 immigrants who crossed illegally into the U.S. since December 2018.

The Department of Justice established a pilot program, a fast-track immigration court system, which created expedited court proceedings in 10 border cities

But 87.5 per cent of immigrants in the program failed to appear before a judge.

Republican proposals for solving the problem of finding illegal immigrants have been scattershot and varied.

Former New Jersey Gov. Chris Christie said in August 2015 that if he were president he would ask FedEx to devise a system to track non-citizens when they come in.

'At any moment, FedEx can tell you where that package is. It's on the truck. It's at the station. It's on the airplane,' Christie told a crowd in Laconia, New Hampshire. 'Yet we let people come to this country with visas, and the minute they come in, we lose track of them.'

'We need to have a system that tracks you from the moment you come in, and then when your time is up ... however long your visa is, then we go get you. We tap you on the shoulder and say, 'Excuse me. Thanks for coming. Time to go',' he said.

Nearly four years later, with Democrats in control of the more camera-hungry half of Congress, Trump has found himself making a political case for a tougher immigration policy in the hope of helping Republicans reclaim all of Washington's power-levers.

House Democrats have declared most of his proposals dead on arrival.

'The Democrats now realize that there is a National Emergency at the Border and that, if we work together, it can be immediately fixed. We need Democrat votes and all will be well!' he tweeted Friday,

'Will the Democrats give our Country a badly needed immigration win before the election? Good chance!'

His Border Patrol is now advertising for contractors to move 60,000 people a year from the border to elsewhere in the country to be put in shelters as family units, or as unaccompanied children.

The contract, revealed by Fox News, would move them by plane to unspecified destinations.

But a parallel plan sparked anger in Florida Friday, with its Republican governor - elected by a razor-thin margin - voicing fury at a plan to process immigrants in two of its counties.

Ron DeSantis said he will fight a federal plan to fly hundreds of immigrants from the Mexican border to Broward and Palm Beach, where county officials said they were notified by Border Patrol that more than a 100 immigrants would be sent weekly to each of the counties starting in about two weeks.

'We cannot accommodate in Florida just dumping unlawful migrants into our state. I think it will tax our resources, the schools, the health care, law enforcement, state agencies,' DeSantis told reporters in Sarasota after a bill signing ceremony.

Palm Beach County Sheriff Ric Bradshaw said Thursday he was notified of the plans by the Miami-based office of the U.S. Border Patrol, and that a total of 1,000 people per month would be brought to the two counties from the El Paso, Texas, area. He said immigrant parents and children would be processed in both Florida counties, given a notice to appear in court, and then released into the community.

'If you believe what was leaked and reported, the plan would be to simply put migrants out on the street,' DeSantis said. 'This would be potentially just releasing people into our society. With someone just coming across the border, we have no idea what their background is, we don't know what type of criminal activity they've been involved in. We don't know anything.'

He said he would appeal directly to Trump, saying he believed it was not the president's plan.

Palm Beach County is where Trump's Mar-a-Lago club is located.

It also emerged Friday that Trump wants the border wall between the U.S. and Mexico to be painted black and have spikes at the top so it looks more intimidating, former and current administration officials told The Washington Post.

According to the sources, Trump is micromanaging the project down to the smallest details.

Recently he told White House aides, Homeland Security officials and military engineers that the wall should be painted 'flat black' so it would absorb more heat in the summer and make it harder for climbers to scale the metal.

The president, at one point, considered a design plan that included a field-tested anti-climbing surface and rounded metal cylinders, but he said he didn't like the appearance, claiming metal points would look more intimidating.

He told a group of aides that spikes would cut climbers' hands and be a more effective in deterring them from scaling the wall.

A DHS official says Trump thinks the wall can be 'effective' and 'doesn't have to be an eyesore'

Although the wall will not be a concrete barrier, like the president originally touted, he is OK with a steel 'slatted' fence. While on the 2016 campaign trail, Trump would often tell crowds chanting, 'build the wall,' that it would be big and 'beautiful.'

'He thinks not only can the wall be effective, it doesn't have to be an eyesore,' a Homeland Security official said. 'He wants one standard uniform height. That's what he's going for, and we have to match that with operational reality.'

Engineers and aides are often left confused with Trump's ever-shifting instructions and suggestions for even the smallest details of the border wall.

The president has demanded that while the wall should be physically imposing, it should also be aesthetically pleasing. An administration official familiar with Trump's opinions said, 'He thinks it's ugly.'

The White House is diverting billions in defense and military funds to fast-track the border barrier construction.

Pentagon documents revealed last weekend that the Department of Defense would be reassigning $1.5 billion of its funding from other projects to the constructing 80 additional miles of southern border wall.

That money was originally allocated to other programs, including ground maintenance for Minuteman III, a nuclear intercontinental ballistic missile with 450 missiles, and plans for planes that provide surveillance and communication to fighter jets while airborne.

The documents, and acting Secretary of Defense Patrick Shanahan, say that the plans will not affect military preparedness.

In addition to the $1.5 billion, another $1 billion in Army personnel money was set aside in March, and $3.6 billion in military construction projects are being delayed for additional border wall allocations.

DHS officials say the president has demanded on several occasions that they come to the White House on short notice to discuss wall construction. The officials also said that Trump would often wake up former DHS Secretary Kirstjen Nielsen early in the morning to discuss the project.

Nielsen was ousted as Defense secretary last month over her conflicting views with the president.

Trump expressed concern with officials when he was told it would take years to complete construction, and has even suggested that some of his friends and associates in New York would have ideas on how to get it built faster.