Niger's opposition says it won't recognize results for the presidential runoff vote on March 20.

Opposition coalition spokesman Amadou Djibo said Thursday the coalition will also not recognize institutions stemming from the vote, and is asking supporters to boycott polls.

The call comes the day after the party's candidate, Hama Amadou, is reported to have been evacuated to Paris for medical treatment. Amadou, a former prime minister, faces President Mahamadou Issoufou in the runoff. Amadou's spokesman last week said health problems saw him transferred to a Niamey hospital.

Amadou has been detained since November for alleged involvement in a baby-trafficking scheme, a charge he has dismissed as politically-motivated.

The opposition coalition also called for a political transition to organize new elections, saying the Feb. 21 vote saw rigging.