A US federal judge has blocked the Trump administration's use of $1 billion in funds to construct a wall along the southern border with Mexico, but declined to issue a permanent injunction.

Members of a militia group, whose alleged leader applies to build Donald Trump's border wall, pleads guilty to bombing a mosque in an effort to frighten American Muslims into leaving the country.

US President Donald Trump pledged on Sunday not to bend in his demand for a wall along the southern border with Mexico but said the barrier could be made of steel instead of concrete as a potential compromise with Democrats who refuse to fund it.