George W. Bush declared 13 emergencies and Barack Obama declared 12 — nearly all of which are still active today. Bill Clinton declared 17 national emergencies, six of which are still active. Ronald Reagan declared six and George H.W. Bush declared four — but all of those have been revoked by now.
The first declaration under the National Emergencies Act of 1974 came during the Iran hostage crisis — a national emergency that is still active today. Jimmy Carter blocked Iranian government property from entering the country. It’s been renewed each year by all presidents since then.
Presidents must renew national emergencies every year because the statute lets emergencies automatically expire after one year.
A special White House panel led by New Jersey Republican Gov. Chris Christie recommended that Trump make an emergency declaration on opioids. A statement from the White House in August said Trump has “instructed his Administration to use all appropriate emergency and other authorities to respond to the crisis caused by the opioid epidemic.”