An already turbulent political landscape in Haiti threatened to descend into further turmoil on Thursday as a power struggle between two competing prime ministers stoked tensions after the assassination of President Jovenel Moïse.
The country’s interim prime minister, Claude Joseph, has said he is in charge and declared a “state of siege” for 15 days, essentially putting the country under martial law. But even constitutional experts are unsure whether he has the legal authority to impose it and whether he can stay in power.
Mr. Joseph was supposed to be replaced this week by Ariel Henry, who had been appointed prime minister by Mr. Moïse in recent days. But hours after the killing, Mr. Joseph assumed leadership of Haiti, taking command of the police and army in what he said was an effort to ensure order and stability.
Mr. Henry, in an interview with the Nouvelliste newspaper, said that Mr. Joseph was “no longer prime minister” and instead…