washington u.s. senate vote next week ratification montenegro new member nato alliance senate majority leader mitch mcconnell say thursday trump administration urge lawmakers take long-delayed matter reuters report tuesday secretary state rex tillerson write leaders senate say montenegro membership north atlantic treaty organization strongly interest unite state 28 nato members must ratify montenegro accession formally join alliance vote u.s. senate hold months least two republican senators rand paul mike lee block quick vote senate republican leadership schedule time-consuming roll call vote thursday mcconnell announce senate would procedural vote monday even clear way final ratification vote late week senate aid say expect senate would approve montenegro nato membership vote take place u.s. senate vote montenegro 's nato membership