The US Supreme Court's approved $2.5 billion of military funding to be used for a section of Donald Trump's promised wall on America's border with Mexico.
The country's highest court decided in a 5-to-4 ruling to overturn a lower court injunction.
It is not a final ruling on the case, but indicates the country's highest court is likely to back the Trump administration's moves to use Pentagon money to begin work on the controversial border wall.
The court's decision effectively allows the money to be used and work proceed while the legal proceedings continue.
Members of the court's liberal wing opposed the decision.
In a dissenting opinion, Justice Stephen Breyer suggested the court should for now have allowed the US government to 'finalise the contracts at issue, but not to begin construction'.
However, the majority decision suggested those opposing the administration may not have the legal right to do so.
In a tweet, the US president hailed the move as a "big victory":
Democratic House speaker Nancy Pelosi, meanwhile, suggested the ruling was "deeply flawed".
She said it would let Mr Trump "steal military funds to spend on a wasteful, ineffective border wall rejected by Congress".
A border wall between the US and Mexico was one of Donald Trump's key campaign pledges in 2016 - claiming it would help limit the flow of illegal immigrants into the US.
However, the plan has been fiercely opposed by Democrats and other organisations, and it has frequently emerged as a sticking point in budget negotiations between Democrats and Republicans.
Earlier this year, the US president confirmed that he would declare a national emergency in a bid to secure funding for his wall.
