Democratic attorneys general across the United States on Sunday condemned President Donald Trump's order to restrict people from seven Muslim-majority countries from entering the country and are discussing whether to challenge the administration in court.
The order suspended all immigration for citizens of the seven countries for 90 days.
Ferguson has been vocal in his opposition to Trump's immigration restrictions, earlier joining 15 other state attorney generals in denouncing Trump's order as "unconstitutional, un-American and unlawful".
Federal judges in three states followed a USA judge in NY in barring authorities from deporting travelers affected by Trump's executive order.
The Trump administration, and Trump himself have reportedly said that the move is aimed at protecting the nation against extremists looking to attack Americans and American interests. This lawsuit will be more general and could have a nationwide impact, he said.
He also filed a motion for a restraining order to temporarily stop the implementation of the executive order.
Local tech giant Amazon wrote a declaration in support of the suit, along with Expedia. Patty Murray, Gov. Jay Inslee and Seattle Mayor Ed Murray, also have been vocal in their opposition to Trump's immigration order.
Asked if he fears retaliation from the Trump administration, Inslee said "there's no predicting this president, but we will not yield, we will not be leveraged, we will not be threatened, we will not be intimidated".
"Resistance is not futile", Governor Inslee said.
USA green card holders will require additional screening before they can return to the United States, the White House said on Saturday.
The UAE's official news agency said the sheikh told Trump "that extremism and terrorism have no religion or identity and the groups that preach false slogans and ideologies seek to disguise their criminal intention in spreading chaos and destruction".
Countries included in the ban are Iraq, Syria, Iran, Sudan, Libya, Somalia and Yemen.
Oregon Attorney General Ellen Rosenblum said Trump's order "reinstates national origin discrimination, something that President Lyndon B. Johnson long ago rejected as 'harsh injustice.' We will not go back to those days of our American history".
More people were reportedly affected by the ban over the weekend at airports across the country.
"Refugees are our coworkers, neighbors, friends, business owners, community leaders and family members".