U.S. sues to stop Aon’s purchase of Willis Towers Watson

WASHINGTON, June 16 (Reuters) – The U.S. Justice Department filed a lawsuit on Wednesday aimed at stopping insurance broker Aon’s (AON.N) $30 billion acquisition of Willis Towers Watson because it would reduce competition and could lead to higher prices.

The deal would combine the second and third largest of the “Big Three” global insurance brokers, the department said. The third is Marsh McLennan.

Aon and Willis, which was formed in a 2016 merger, put together insurance contracts for clients that involve a number of insurance providers, for coverage ranging from airlines to large sporting…