King and the UAW announced the withdrawal on the morning of the scheduled start of an NLRB hearing in Chattanooga on the union’s objection.
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More than just a tactical defeat, this might be a watershed moment in the history of organized labor, as Reuters reports the United Auto Workers has dropped its challenge against a pivotal February election in Tennessee:

The United Auto Workers union on Monday said it was withdrawing its objection claiming undue outside political interference in the result of a February election it lost among workers at the Volkswagen AG plant in Tennessee.

UAW President Bob King, in a statement issued by the union on Monday, said the process of objecting to the National Labor Relations Board could have dragged on for months if not years.