Justice Department lawyers filed the documents in US District Court in Seattle, two days before the executive order is set to go into effect.
Washington and several other states are trying to block the revised ban that affects six mostly Muslim nations, saying it's unconstitutional.
Government lawyers say the new version removed provisions that "purportedly drew religious distinctions - erasing any doubt that national security, not religion, is the focus."
Trump's revised ban applies to Somalia, Iran, Syria, Sudan, Libya and Yemen and temporarily shuts down the US refugee program.
Unlike the original order, it says people with visas won't be affected and removes language that would have given priority to religious minorities for entry to the US Washington Attorney General Bob Ferguson, joined in his lawsuit by heavily Democratic California, Maryland, Massachusetts, New York and Oregon, said the revised ban is still flawed and harms residents, universities and businesses, especially tech companies such as Washington state-based
A hearing in a separate lawsuit by Hawaii is scheduled for Wednesday.
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