U.S. President Donald Trump's temporary immigration ban faced a legal hurdle on Monday that could determine whether he can push through the most controversial and far reaching policy of his first two weeks in office.

The government has a deadline to justify the executive order temporarily barring entry to the United States of people from seven Muslim-majority countries and halting the U.S. refugee program.

A federal judge in Seattle suspended the order on Friday, opening a window for travelers from the seven countries to enter.