Acting White House chief of staff Mick Mulvaney signaled Sunday that President Trump is prepared to declare a national emergency in order to obtain funding for a border wall.

A temporary spending deal was reached last week to reopen large swaths of the federal government that were shuttered for more than a month. The White House and Congress now have three weeks to come up with a long-term legislative solution, which Mulvaney said on “Fox News Sunday” would be the “right way” to obtain funding to fulfill Trump’s demand for $5.7 billion in funding for a barrier along the U.S.-Mexico border.