A federal judge has blocked US President Donald Trump from building sections of his border wall with money secured under his declaration of a national emergency.

US District Judge Haywood Gilliam Jr. on Friday immediately halted the administration’s efforts to redirect military-designated funds for wall construction.

His order applies to two projects, scheduled to begin as early as Saturday, to replace 82 kilometres of fence in two areas on the Mexican border.

Judge Gilliam issued the ruling after hearing arguments last week in two cases. California and 19 other states brought one lawsuit; the Sierra Club and a coalition of communities along the border brought the other.

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