GOP senator voices concern about Trump order, hasn't decided whether he'll back it

Sen. Ron JohnsonRonald (Ron) Harold JohnsonWhistleblower retaliation: Stop confusing unlawful attacks with politics Congress looks to strengthen hand in State Department following impeachment Senate braces for fight over impeachment whistleblower testimony MORE (R-Wis.) has expressed concerns about the precedent set by President TrumpDonald John TrumpSchiff blasts Trump for making 'false claims' about Russia intel: 'You've betrayed America. Again.' Poll: Sanders leads 2020 Democratic field with 28 percent, followed by Warren and Biden More than 6 in 10 expect Trump to be reelected: poll MORE's national emergency declaration to reallocate funding for a border wall. 

During an interview with Chuck Todd set to air in full Sunday on NBC's "Meet the Press," Johnson said he shared concerns from other GOP lawmakers that future presidents could follow Trump's example and declare emergencies to circumvent Congress.

“Absolutely I share those concerns which is why we’re going to take a very careful look at what he’s doing here in this instance,” Johnson said.

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He added that he was not sure if he would support a congressional resolution to disapprove of Trump's declaration.

“I’m going to take a look at it and I’ll decide when I actually have to vote on it,” Johnson said in a clip from the interview released Saturday. He added that he would have doubts about the president's declaration if he did not intend to rapidly use the money.

Democrats are readying an aggressive response to Trump's decision Friday to declare a national emergency at the border, including potentially trying to block the move with legal action or legislation.

Reps. Alexandria Ocasio-CortezAlexandria Ocasio-CortezOcasio-Cortez claps back after article on her dress: 'Sequins are a great accessory to universal healthcare' Democrats working to ensure Trump's second term Ocasio-Cortez announces slate of all-female congressional endorsements MORE (D-N.Y.) and Joaquin CastroJoaquin CastroJulián Castro endorses Rep. Cuellar's primary opponent in Texas Harris, Castro introduce resolution condemning Trump aide Stephen Miller As Mexico abuses migrants under Trump's orders, where is Congress? MORE (D-Texas) said this week that they planned to introduce legislation to stop the emergency declaration. A Democratic aide said the pair was working to build support. 

Trump on Friday declared an emergency to allocate additional money to build a barrier at the U.S.-Mexico border. The president made the announcement while saying that he would sign a bill to keep the government fully funded through the rest of the fiscal year.

The White House plans to redirect $3.6 billion in military construction funding toward the border project, and repurpose about $2.5 billion from the Defense Department’s drug-interdiction program and another $600 million from the Treasury Department’s asset-forfeiture fund through a separate executive action.

“I could do the wall over a long period of time. I didn’t need to do this, but I’d rather do it much faster,” Trump said when announcing his declaration Friday.

Critics immediately pounced on the comment, arguing it undermined the president's position that an emergency exists at the border. The White House later sought to clarify the remark.

Several groups have already said they would sue the president over the declaration.