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 on Tuesday evening pulled back from his threats to close the southern border, claiming that Mexico is now cooperating in apprehending migrants.

For the "first time in decades," Trump said, Mexico had "apprehended over a thousand people" at its southern border and returned them to their home countries.

“I really wanted to close it. But now Mexico is saying, ‘No, no, no.’ First time in decades. ‘We will not let anybody get through.’ And they’ve apprehended over a thousand people at the southern border, their southern border. And they’re bringing them back to their countries," Trump said during remarks at the National Republican Congressional Committee's annual spring dinner.

Four days after issuing a firm threat to shut down the U.S. southern border as soon as this week, President Donald Trump was far less definitive in a recent speech. @JonKarl has the latest. https://t.co/Gv6VTTzjmz pic.twitter.com/8mcHoh3agb — Good Morning America (@GMA) April 3, 2019

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Trump earlier in the day shifted away from his threats to close the border this week, saying he would "100 percent" close the border or "close large sections of the border" if Congress didn't pass stricter immigration laws.

"If we don’t make a deal with Congress, the Mexico border’s going to be closed. 100 percent," Trump told reporters in the Oval Office. "Or we’re going to close large sections of the border, maybe not all of it. But it’s the only way we’re getting a response, and I’m totally ready to do it."

The president's apparent retreat Tuesday evening came after Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) warned Tuesday that closing the border would have a "potentially catastrophic" impact on the economy.

"We certainly have a crisis on the border. I think the president’s right about that. Closing down the border would have potentially catastrophic economic impact on our country, and I would hope we would not be doing that sort of thing," McConnell told reporters.