United Auto Workers union President Shawn Fain said Tuesday the group plans to hold strike authorization votes against Stellantis because the automaker was failing to live up to guarantees it made during a labor deal struck last year.

The United Auto Workers will ask members to green light a strike against Stellantis NV, escalating an already tense standoff with one of the world’s largest car manufacturers.

Chrysler and Jeep parent Stellantis is potentially facing a fresh strike as United Auto Workers (UAW) President Shawn Fain said the union plans to hold a vote authorizing a walkout after the automaker allegedly abandoned contract commitments it made during a labor deal struck last year.