President Trump on Thursday threatened to veto Democratic bills, including an infrastructure bill, until Congress approves legislation to expand the southern U.S. border wall.

“The Democrats, who know Steel Slats (Wall) are necessary for Border Security, are putting politics over Country,” Trump tweeted Thursday morning. “What they are just beginning to realize is that I will not sign any of their legislation, including infrastructure, unless it has perfect Border Security. U.S.A. WINS!”



The Democrats, who know Steel Slats (Wall) are necessary for Border Security, are putting politics over Country. What they are just beginning to realize is that I will not sign any of their legislation, including infrastructure, unless it has perfect Border Security. U.S.A. WINS! — Donald J. Trump (@realDonaldTrump) December 20, 2018



[Read more: Fox News host urges Trump to veto 'crap' bill with no wall funding]

Trump's threat against bills favored by Democrats could be a sign he's ready to sign a short-term funding bill that Congress will send him on Thursday. That bill doesn't including any new funding for his border wall, but Trump is widely expected to sign it even though he had threatened to veto it a few weeks ago.

Funding for the Department of Homeland Security, along with eight other federal agencies, runs out Friday at midnight, and if a spending bill is not passed before that time, the government will go into partial shutdown.

Republicans proposed a continuing resolution on Wednesday morning, which was passed last night. Congressional leaders say that they expect Trump to sign the short-term bill before the shutdown deadline, which will keep the government open and operational through Feb. 8.

Last week, Trump told Democratic leaders Rep. Nancy Pelosi, Calif., and Sen. Chuck Schumer, N.Y., that he would be “proud to shutdown the government” in order to push for more border security, including funding for the wall.

On Tuesday, Trump attempted to appeal to Democrats with a description of the physicality of the wall, claiming that it would be “beautiful,” and made of “artistically designed steel slats.”