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

Sen. Ron JohnsonRonald (Ron) Harold JohnsonBarr throws curveball into Senate GOP 'spying' probe Bipartisan group of senators introduce legislation designed to strengthen cybersecurity of voting systems Trump Jr. subpoena spotlights GOP split over Russia probes MORE (R-Wis.) has expressed concerns about the precedent set by President TrumpDonald John TrumpTrump rips Dems' demands, impeachment talk: 'Witch Hunt continues!' Nevada Senate passes bill that would give Electoral College votes to winner of national popular vote The Hill's Morning Report - Pelosi remains firm despite new impeachment push 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-CortezThe Memo: Trump allies see impeachment push backfiring on Democrats Republican wins special House election in Pennsylvania WHIP LIST: Dems who support an impeachment inquiry against President Trump MORE (D-N.Y.) and Joaquin CastroJoaquin CastroPelosi faces tipping point on Trump impeachment Congressional Hispanic Caucus demands answers on death of migrant children House Democrats press leaders to start Trump impeachment 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.