A “dissent cable” has been drafted for senior State Department officials, ABC News and the Associated Press say.
Draft text seen by the BBC says that the ban on nationals from seven Muslim-majority countries will not make the US safer and is un-American.
President Trump issued the restrictions on Friday.
His executive order halted the entire US refugee programme for 120 days, indefinitely banned Syrian refugees and suspended all nationals from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen.
See more at: http://www.bbc.com/news/world-us-canada-38799796