Conservative commentator Ann Coulter on Thursday slammed the news that President TrumpDonald John TrumpThe Hill's Morning Report - White House, Congress: Urgency of now around budget GOP presses Trump to make a deal on spending Democrats wary of handing Trump a win on infrastructure MORE will sign off on a border security deal brokered by Congress, calling it "selling out" GOP constituents.

"GOP motto: NEXT TIME! We're selling out our constituents this time -- but we'll get to our promises NEXT TIME. We thought Trump was different," Coulter tweeted in response to an announcement from Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellThe Hill's Morning Report - White House, Congress: Urgency of now around budget GOP presses Trump to make a deal on spending Overnight Health Care — Presented by PCMA — McConnell, Kaine offer bill to raise tobacco buying age to 21 | Measles outbreak spreads to 24 states | Pro-ObamaCare group launches ad blitz to protect Dems MORE (R-Ky.) that Trump would sign the legislation and declare a national emergency at the border.

McConnell's comments ended speculation over whether Trump would agree to sign the funding deal, which includes $1.375 billion in funding for roughly 55 miles of new barriers along the southern border. 

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The president must sign the bill before the end of the day on Friday to avoid a second government shutdown this year.

The president has for weeks raised the prospect of declaring a national emergency to direct construction of his long-desired border wall. The move is sure to draw legal challenges. Republicans have been reluctant to support an emergency declaration, noting it could set a dangerous precedent for future presidents.

Coulter, who backed Trump in the 2016 election but has been critical of the president over his inability to secure funding for a wall along the southern border, is among the conservatives with hard-line immigration views who have panned the deal reached by Congress.

A number of other conservative commentators have been critical of the agreement, including Fox News host Laura Ingraham, who urged Trump not to sign it.