Sen. Susan Collins Susan Margaret CollinsSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-Maine) on Thursday said that she expects a number of Republican senators to vote to approve a resolution to block 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's emergency declaration to secure funding for a border wall.

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"I haven’t taken a count, but I can tell you from talking with my colleagues that many are troubled, even those who are the strongest supporters of the president and his views on border security," Collins said on CNN's "New Day."

Collins pushed back on Trump's tweet a day earlier in which he argued the looming Senate vote to rebuke his emergency declaration was about border security, not precedent or constitutionality.

"I don’t see it as being what this vote is about," the Maine moderate said. "I support stronger border security, including a wall where it makes sense along the border, but what this debate is about is whether the president of the United States can take billions of dollars that have been appropriated that he has signed into law, and then repurpose them for other projects."

More Republicans will vote to block President Trump’s national emergency declaration over the border wall, @SenatorCollins says.



“Many are troubled, even those who are the strongest supporters of the President and his views on border security.” https://t.co/KXK0OOPOBH pic.twitter.com/Aw3ISFvs5G — CNN (@CNN) March 7, 2019



Collins is one of four GOP senators who has publicly said they will vote for a resolution to terminate Trump's emergency declaration and others have taken up an effort to persuade the president to back off the move amid widespread concerns.

The House already passed a resolution to block the emergency declaration, and the Senate is scheduled to vote on the measure next week. Trump has said he will veto the resolution if it reaches his desk.

Collins said Thursday that she believes there's a humanitarian crisis at the border that requires action, but the president would be better off trying to work with Congress to submit a supplemental appropriation.

"I’ve supported billions of dollars to help deal with that humanitarian crisis to put up physical barriers, to increase technology, to have more personnel and roads through remote areas," she said. "We need an all of the above approach and we need to the be guided by the experts at the DHS. But still, that doesn’t change the fact of the separation of powers under the Constitution, and that’s what I’m concerned about."