Sessions said Federal Judge Derrick Watson was undermining national security and improperly micromanaging presidential powers when he ruled to expand the definition of "close family relationships" which determines which people with family in the United States can be excepted from the 90-day-ban.
Watson said Thursday the government's definition of "close family" was too narrow. He said "common sense", as well as accepted US practice, means that grandparents, grandchildren, aunts, uncles, nieces, nephews and cousins should be included for exceptions.
But Sessions said the Hawaii court was overstepping its powers.
"By this decision, the district court has improperly substituted its policy preferences for the national security judgments of the executive branch in a time of grave threats, defying both the lawful prerogatives of the executive branch and the directive of the Supreme Court," Sessions said in a statement.
After a five month legal battle over the original travel ban, on June 26 the Supreme Court partially backed the government's appeal over several federal courts and allowed Trump to proceed with it.
The government then implemented the ban, limiting exceptions to parents, spouses, children, sons- and daughters-in-law, siblings and step- and half-siblings.
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