President Donald Trump has threatened a government shutdown unless Congress hands him more funding for his proposed southern border wall. Now he’s demanding full funding for the project this year.

Trump said he will attempt to secure full funding for his proposed U.S.-Mexico border wall during the next congressional appropriations process. That would mean he will demand both chambers approve up to $25 billion for the U.S.-Mexico border barrier, a figure pitched earlier this year by senior White House officials.

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During a White House event on so-called sanctuary cities, the president said his administration already has “started the wall.” But that contention has been challenged by critics who say the administration is merely replacing existing barriers; they also say new construction has been limited to eight wall prototypes Trump visited earlier this year.

But Trump on Wednesday declared of the wall he promised to build as a candidate: “We’ve made a lot of progress on it.”