Haiti's head prosecutor has invited Prime Minister Ariel Henry to explain his connection to the main suspect in the killing of President Jovenel Moise.
President Moise was assassinated when gunmen stormed his home on 7 July.
Prosecutor Bedford Claude said that Mr Henry had multiple phone calls with suspect Joseph Felix Badio just hours after the assassination.
Mr Claude said Mr Henry was being "invited" to attend, as he did not have the authority to officially summon him.
Prosecutors said records obtained from phone operator Digicel confirmed that Mr Badio and Mr Henry spoke twice on 7 July just hours after President Moise's killing.
Geolocation data also showed that Mr Badio, whose whereabouts are currently unknown, was speaking from the scene of the crime.