A group of Democratic senators has sent a list of questions to two companies that own local TV stations across the country to address why they refuse to air Jimmy Kimmel's late-night talk show — even after ABC made the decision to bring it back.

Democratic Sens. Elizabeth Warren of Massachusetts, Ron Wyden of Oregon, Ed Markey of Massachusetts and Chris Van Hollen of Maryland signed a 7-page letter on Tuesday addressed to Perry A. Sook, the chairman of Nexstar Media Group, and Christopher S. Ripley, the president and chief executive of Sinclair Broadcast Group.

Sinclair owns about 40 ABC-affiliated local TV stations, while Nexstar, the country's largest TV broadcaster, owns around 30 ABC-affiliated TV stations in various markets.

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