White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE said Sunday that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE is serious in threatening to close the U.S.-Mexico border.

“It certainly isn’t a bluff. You can take the president seriously," she said during an appearance on "Fox News Sunday" when asked by host Chris Wallace whether Trump was "bluffing" when he said he will likely close the border.

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Conway added that Congress "can fix this."

"Congress can fix the problem of immigration that they’ve failed to fix. This president is looking at the metrics," she said, adding that the U.S. has "never seen a surge" in immigration "like this."

Trump said Friday that “there’s a very good likelihood” he will close the entire southern border this week.

The president said that Mexico is "going to have to do something, otherwise I’m closing the border."

"I’ll just close the border. And with a deficit like we have with Mexico and have had for many years, closing the border would be a profit-making operation. When you close the border also you will stop a lot of the drugs from coming in," he added.

He said in a tweet Thursday that he "may close the Southern Border," adding that Mexico was "doing NOTHING to help stop the flow of illegal immigrants to our Country."