As it turns out, The DOJ isn't ready to let a federal judge's decision to kill its challenge to the AT&T-Time Warner merger go unchallenged. A month after the judge's ruling was handed down - and after the judge effectively warned the federal government not to appeal - the DOJ has done just that, reviving the federal government's fight to block the $85 billion 'vertical integration' deal.

The news sent shares of AT&T lower just under 1% in the after-market:

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Investors will now be looking out for more information regarding what aspect of the judge's ruling the DOJ will choose to challenge.