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

Sen. Ron JohnsonRonald (Ron) Harold JohnsonGraham vows Biden, Ukraine probe after impeachment trial GOP warns of 'drawn out' executive privilege battle over Bolton testimony  Senate Republicans confident they'll win fight on witnesses MORE (R-Wis.) has expressed concerns about the precedent set by President TrumpDonald John TrumpTrump says his advice to impeachment defense team is 'just be honest' Trump expands tariffs on steel and aluminum imports CNN's Axelrod says impeachment didn't come up until 80 minutes into focus group 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-CortezImpeachment throws curveball in Iowa to sidelined senators Sanders says it's 'disappointing' he's not on campaign trail in Iowa The Hill's Campaign Report: Ten days to Iowa MORE (D-N.Y.) and Joaquin CastroJoaquin CastroThe Hill's Morning Report — Dems detail case to remove Trump for abuse of power Warren campaign hires two top Castro staffers Democrats press Trump administration to stop DNA collection from detained migrants 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.