Trade groups file suit challenging Maryland's new digital ad tax

The U.S. Chamber of Commerce and trade groups representing large tech companies like Amazon, Facebook and Google have filed a lawsuit seeking to kill Maryland's first-in-the-nation tax on digital advertising. The groups claim the law enacted by the Maryland General Assembly last week is unconstitutional and violates federal laws regarding the internet and e-commerce. The lawsuit, filed in the U.S. District Court in Baltimore, names Maryland Comptroller Peter Franchot as the defendant in his official…