President Trump has suggested that he might resort to using "emergency" powers to build his border wall if he is not able to reach agreement on funding with congressional Democrats.
"We are looking at it very strongly," Trump told reporters on Sunday. "We're looking at a national emergency, because we have a national emergency."
The president does have broad powers to act in a crisis situation, but those powers are not unlimited. And critics say Trump should be careful about invoking them in this instance.