Conservative pundit Ann Coulter said Friday that President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE is “lazy and incompetent” and warned that he might face a challenger for the Republican presidential nomination if he does not uphold his promise to build a border wall.

“We put this lunatic in the White House for one reason,” she said on Yahoo News's Skullduggery podcast, claiming that she was simply reminding the president of his promise to deliver on securing border wall funding.

Asked who she thought should challenge Trump for the Republican nomination in 2020, Coulter suggested Rep. Mo Brooks Morris (Mo) Jackson BrooksOvernight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals,' official says MORE (R-Ala.).

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Brooks recently argued that Trump had the right to declare a national emergency to build a wall along the southern U.S. border, calling illegal crossings a “national emergency of major proportions.”

Coulter has heaped criticism on the president in recent weeks, urging Trump to build his long-desired border wall.

The conservative firebrand most recently dubbed Trump a "wimp" after he announced his intentions to sign a three-week spending bill effectively ending the 35-day partial government shutdown without securing border wall funding.

“Good news for George Herbert Walker Bush: As of today, he is no longer the biggest wimp ever to serve as President of the United States,” she tweeted shortly after Trump's announcement.

Coulter has long been seen as a gauge for Trump of his support among his conservative base. Before the record-long shutdown began in December, Coulter said she would not vote for Trump again in 2020 unless he followed through on his border wall.