President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE on Thursday expressed doubt about a bipartisan congressional committee’s ability to secure funding for a border wall, just one day after the group met for the first time.

Trump tweeted that Republicans on the panel “are wasting their time” because Democrats “are not going to give money to build the DESPERATELY needed WALL.”

“I’ve got you covered. Wall is already being built, I don’t expect much help!” the president wrote, without providing specifics.

Republicans on the Homeland Security Committee are wasting their time. Democrats, despite all of the evidence, proof and Caravans coming, are not going to give money to build the DESPERATELY needed WALL. I’ve got you covered. Wall is already being built, I don’t expect much help! — Donald J. Trump (@realDonaldTrump) January 31, 2019

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Trump’s comments could box in Republican lawmakers who are trying to broker a border security agreement with Democrats in order to avert another government shutdown before the Feb. 15 deadline.

Democrats’ opening offer in the Wednesday meeting did not include wall funding, but they also did not close the door entirely to providing money for physical barriers along the border.

Trump last Friday signed a three-week funding measure to reopen the government in order to buy more time for wall negotiations. But his remarks Thursday indicate he could make good on his threat to declare a national emergency to circumvent Congress and build the wall on his own.

The president’s message came after he shifted the terms he is using in the debate over border security.

After weeks of downplaying the need for a wall along the U.S.-Mexico border, and saying “steel slats” or “fencing” could work, Trump returned to his original demand for a wall.

“Lets just call them WALLS from now on and stop playing political games! A WALL is a WALL!” Trump tweeted.

Lets just call them WALLS from now on and stop playing political games! A WALL is a WALL! — Donald J. Trump (@realDonaldTrump) January 31, 2019

Republican lawmakers hoping to strike a deal with Democrats had also preferred to use the word “barrier” instead of “wall.”

“It could be a barrier. It doesn’t have to be a wall,” House Minority Leader Kevin McCarthy Kevin Owen McCarthyTrump asked Chamber of Commerce to reconsider Democratic endorsements: report The Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill Trump's sharp words put CDC director on hot seat MORE (R-Calif.) told reporters earlier in the week.

Updated at 9:05 a.m.