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

Sen. Ron JohnsonRonald (Ron) Harold JohnsonScott Walker considering running for Wisconsin governor or Senate: report GOP moves to rein in president's emergency powers The Hill's 12:30 Report: O'Rourke jumps into 2020 fray MORE (R-Wis.) has expressed concerns about the precedent set by President TrumpDonald John TrumpMueller report findings could be a 'good day' for Trump, Dem senator says Trump officials heading to China for trade talks next week Showdown looms over Mueller report 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-CortezOvernight Energy: Interior reverses decision at heart of Zinke criminal probe | Dem divisions deepen over approach to climate change | GM to add 400 workers to build electric cars 'Washington Monthly' editor says diversity on Capitol Hill starts with interns Why is my party prioritizing an extreme environmental agenda? MORE (D-N.Y.) and Joaquin CastroJoaquin CastroBooker takes early lead in 2020 endorsements Julian Castro hints at brother Joaquin's Senate run Dems prepare next steps after Trump's veto 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.