An antitrust case targeting Google's ad exchange platform is part of a larger bipartisan crackdown on big tech firms in the U.S.

Alphabet’s GOOGL-Q Google will seek to avoid a forced sale of part of its online advertising business in its latest faceoff with U.S. antitrust enforcers at a trial starting on Monday in Alexandria, Virginia.

The trial is the government’s next best shot at curbing what a judge has ruled is Google’s monopoly power, after losing a separate bid to make Google sell its Chrome browser earlier this month. Online publishers and rival ad tech developers, some of whom have separately sued Google for damages, will be watching the case closely.

The U.S. Department of Justice and a coalition of states are seeking to make Google sell its ad exchange, AdX, where onlin

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