The new mechanism will enable a six month suspension of visa free travel for citizens of specified third countries. Two objectives of the mechanism are identified. (1) To encourage 'visa reciprocity', by reimposing visa requirements for nationals of countries that still impose them on EU citizens (e.g. the USA, which still imposes visa requirements on citizens from Bulgaria, Cyprus, Romania and Poland). (2) To 'halt substantial and sudden increases in irregular migrant numbers or unfounded asylum requests' from third countries ordinarily benefiting from the visa waiver.