Sen. Susan CollinsSusan Margaret CollinsOvernight Energy: Perry to step down as Energy secretary | Future of big-game hunting council up in the air | Dems lose vote against EPA power plant rule Overnight Defense — Presented by Boeing — Pence says Turkey agrees to ceasefire | Senators vow to move forward with Turkey sanctions | Mulvaney walks back comments tying Ukraine aid to 2016 probe On The Money: Senate fails to override Trump veto over border emergency | Trump resort to host G-7 next year | Senators to push Turkey sanctions despite ceasefire | McConnell tees up funding votes MORE (R-Maine) said that she is "strongly opposed" to President TrumpDonald John TrumpDemocratic senator rips Trump's 'let them fight' remarks: 'Enough is enough' Warren warns Facebook may help reelect Trump 'and profit off of it' Trump touts Turkey cease-fire: 'Sometimes you have to let them fight' MORE's decision to declare a national emergency to build the U.S.-Mexico border wall and supports a lawsuit aimed at blocking him. 
"I support the lawsuit that has been brought and I believe this was an unwise decision by the president," Collins told a Maine TV station in an interview that aired on Tuesday evening. 
Sixteen states, including Maine, have signed on to a lawsuit challenging Trump's emergency declaration. The lawsuit argues that Trump "used the pretext of a manufactured ‘crisis’ of unlawful immigration to declare a national emergency and redirect federal dollars ... toward building a wall."

Collins added that she she wouldn't be surprised if a court ruled against the administration. 
"I would not be at all surprised if the courts find that the president's action is contrary to the separation of powers," she said. "I don't think under the Constitution that he can unilaterally decide to move these funds, which were legally appropriated, from one project to another." 
Trump announced on Friday that he would declare a national emergency after Congress passed a bill that included $1.375 billion for fencing along the border — well below the $5.7 billion requested by the president. 
During a rambling press conference from the Rose Garden, Trump predicted that the 9th Circuit would rule against his emergency declaration, but that he was prepared to take the fight to the Supreme Court where he hoped he would get a "fair shake." 
Collins is one of several GOP senators who have voiced concerns about, or opposition to, Trump's decision to declare a national emergency. Democrats could force a vote on a resolution of disapproval to block the declaration; Collins has not said how she would vote on such a measure.
"I am strongly opposed to the president invoking his national emergency powers. I don't believe that's what the law was intended to cover," she told the Maine TV station, adding that the president's move is of "dubious constitutionality."