President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Monday tweeted that any Democrat who says the U.S. can have border security without a wall can be written off "as just another politician following the party line."

Trump tweeted the remark days before a Dec. 21 deadline for funding the government. The demands for wall funding threaten to close parts of the government on Saturday.

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"Anytime you hear a Democrat saying that you can have good Boarder Security without a Wall, write them off as just another politician following the party line," he wrote on Twitter. "Time for us to save billions of dollars a year and have, at the same time, far greater safety and control!"

Anytime you hear a Democrat saying that you can have good Boarder Security without a Wall, write them off as just another politician following the party line. Time for us to save billions of dollars a year and have, at the same time, far greater safety and control! — Donald J. Trump (@realDonaldTrump) December 17, 2018

Trump has been pushing for Congress to approve $5 billion in funding for the wall. Congress needs to pass a series of funding bills by Dec. 21 to avoid a partial government shutdown. Democrats have refused to provide the $5 billion.

Trump last week said he would be "proud" to shut down the government over the wall funding.

“I am proud to shut down the government for border security,” Trump told House Minority Leader Nancy Pelosi (D-Calif.) and Senate Minority Leader Charles Schumer (D-N.Y.) during a public meeting inside the Oval Office last week.

“I will take the mantle,” he added. “I will be the one to shut it down, I'm not going to blame you for it.”